Certified Clinical Hemodialysis Technician (CCHT) — Questions and Answers

Question 1: A family member asks how they can support their loved one on dialysis. What is the most beneficial form of support to encourage?

Reminding the patient to take all OTC vitamins
Advising the patient to drink extra fluids to stay hydrated
Encouraging the patient to skip sessions if feeling well
Preparing high-protein, low-potassium meals together (Correct answer)

Correct answer: Preparing high-protein, low-potassium meals together

Family support in meal preparation helps patients adhere to the renal diet, which is crucial for managing ESRD complications.

Question 2: The movement of water from an area of low solute concentration to an area of high solute concentration is called:

dialysis
osmosis (Correct answer)
ultrafiltration
diffusion

Correct answer: osmosis

Osmosis is the passive movement of water (solvent) across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. This movement occurs to equalize the solute concentrations on both sides of the membrane. In dialysis, osmosis plays a role in fluid shifts, although ultrafiltration is the primary mechanism for controlled fluid removal.

Question 3: How often should activated carbon filters in the dialysis water treatment system be tested for chlorine/chloramine removal efficacy?

Monthly, with daily visual inspection of filter condition
Before the first patient treatment of each day and after each shift (Correct answer)
Weekly, or after any water utility maintenance in the area
Only when the reverse osmosis membrane is being serviced

Correct answer: Before the first patient treatment of each day and after each shift

AAMI standards require testing the effluent of the activated carbon filters for total chlorine and chloramines before the first patient treatment of the day and after each shift change, because carbon capacity can be exhausted at any time, and breakthrough is not visually detectable.

Question 4: Which of the following is a genetic (inherited) disease that can lead to kidney failure?

Diabetes mellitus, type 2
Polycystic kidney disease (Correct answer)
Glomerulonephritis
Pyelonephritis

Correct answer: Polycystic kidney disease

Polycystic kidney disease (PKD) is a genetic disorder characterized by the growth of numerous fluid-filled cysts in the kidneys. These cysts gradually enlarge and impair kidney function, eventually leading to kidney failure in many individuals. It is one of the most common inherited causes of end-stage renal disease.

Question 5: In the event of a power outage at the dialysis facility and failure of the machine's backup battery, what is the technician's priority?

Manually crank the blood pump to return the patient's blood (Correct answer)
Evacuate the building immediately
Begin documenting the event in the patient's chart
Call the power company to report the outage

Correct answer: Manually crank the blood pump to return the patient's blood

Patient safety is the top priority. The technician must use the hand crank to manually pump the blood from the extracorporeal circuit back to the patient to prevent the patient from losing that blood and to prevent the circuit from clotting.

Question 6: When administering medications through the dialysis circuit, the CCHT must be aware that some drugs are removed by dialysis. Which drug class is most efficiently cleared during hemodialysis?

Large protein-bound drugs
Lipophilic drugs
Small water-soluble drugs with low protein binding (Correct answer)
Highly protein-bound antibiotics

Correct answer: Small water-soluble drugs with low protein binding

Small, water-soluble, non-protein-bound drugs are most efficiently cleared by dialysis due to their ability to cross the semipermeable membrane.

Question 7: Chloramine is particularly dangerous in dialysis water because it can cause which serious complication?

Aluminum toxicity from chloramine-aluminum complexes
Hyperphosphatemia from chlorine interference with phosphate binders
Hypercalcemia from displacement of calcium by chlorine
Hemolytic anemia from oxidative damage to red blood cell membranes (Correct answer)

Correct answer: Hemolytic anemia from oxidative damage to red blood cell membranes

Chloramine (a combination of chlorine and ammonia used as a disinfectant in municipal water supplies) cannot be removed by reverse osmosis and can cross the dialyzer membrane to enter the patient's blood, causing oxidative damage to red blood cell membranes and hemolytic anemia.

Question 8: During dialysis, the blood leak detector alarm activates. What does this indicate and what action should be taken?

Patient blood pressure is dropping; administer saline bolus
The dialysate is too concentrated; dilute with water
Blood is crossing into the dialysate side; stop treatment and do not return blood (Correct answer)
The arterial needle has dislodged; reinsert immediately

Correct answer: Blood is crossing into the dialysate side; stop treatment and do not return blood

A blood leak detector alarm means dialyzer membrane rupture has occurred; blood must not be returned to the patient due to risk of contamination.

Question 9: During the reprocessing procedure, what is the purpose of the 'reverse ultrafiltration' step?

To measure the total cell volume of the blood compartment
To force cleaning agents from the dialysate compartment to the blood compartment (Correct answer)
To test for leaks in the membrane by applying positive pressure
To sterilize the outside of the dialyzer casing

Correct answer: To force cleaning agents from the dialysate compartment to the blood compartment

Reverse ultrafiltration pushes fluid (water and cleaning agents) in the opposite direction of normal dialysis flow, from the dialysate compartment into and through the blood compartment. This helps to dislodge and flush out protein deposits and blood residue from the inner surface of the hollow fiber membranes, ensuring a more thorough cleaning.

Question 10: A patient on dialysis is prescribed a phosphate binder. When should the patient take this medication to achieve maximum effectiveness?

First thing in the morning on an empty stomach
At bedtime to allow overnight absorption
With or immediately before each meal and snack (Correct answer)
Immediately after dialysis to replace dialysis losses

Correct answer: With or immediately before each meal and snack

Phosphate binders work by binding dietary phosphorus in the gastrointestinal tract and preventing its absorption. They must be taken with or immediately before meals and snacks to be in the gut at the same time as the ingested phosphorus.

Question 11: In the context of dialysis adequacy, what does Kt/V represent?

A measure of the patient's blood pressure and volume status.
The rate of ultrafiltration during treatment.
A calculation involving clearance, time, and volume to measure dose of dialysis. (Correct answer)
Potassium (K) and total (t) volume (V).

Correct answer: A calculation involving clearance, time, and volume to measure dose of dialysis.

Kt/V is a measure of dialysis adequacy. 'K' represents the dialyzer's clearance of urea, 't' is the treatment time, and 'V' is the patient's total body water volume. The formula provides a measure of the 'dose' of dialysis delivered.

Question 12: What is the correct patient position for treating hypotension during hemodialysis?

Trendelenburg (legs elevated, head down) (Correct answer)
Standing with support
Sitting upright at 90 degrees
Left lateral decubitus position

Correct answer: Trendelenburg (legs elevated, head down)

The Trendelenburg position (supine with legs elevated above the level of the heart) increases venous return to the heart and improves cardiac output, which is the first-line non-pharmacologic intervention for intradialytic hypotension.

Question 13: What is the primary reason dialyzer reuse programs require each patient to have their own dedicated dialyzer?

To comply with insurance billing requirements
To prevent cross-contamination and bloodborne pathogen transmission between patients (Correct answer)
To allow more accurate TCV measurements
To reduce the cost of dialyzer replacement

Correct answer: To prevent cross-contamination and bloodborne pathogen transmission between patients

Each patient must have their own dedicated dialyzer to prevent cross-contamination with bloodborne pathogens such as HIV, hepatitis B, and hepatitis C. Sharing dialyzers between patients is strictly prohibited regardless of reprocessing.

Question 14: How should a hemodialysis treatment be terminated at the end of a session using the saline rinse-back method?

Connect saline to the arterial line, rinse blood back to the patient, then remove needles (Correct answer)
Remove needles first, then drain blood from the circuit
Stop the blood pump and leave lines attached until blood clots
Stop the pump and clamp all lines simultaneously

Correct answer: Connect saline to the arterial line, rinse blood back to the patient, then remove needles

Saline rinse-back connects saline to the arterial port, uses the blood pump to push remaining blood back to the patient, then lines are clamped and needles removed.

Question 15: The technician's role in patient teaching should be to:

assess the patient’s barriers to learning
reinforce teaching that the patient has received from other team members
determine the patient's learning needs (Correct answer)
check the patient's readiness to learn new information

Correct answer: determine the patient's learning needs

While technicians reinforce teaching, their primary role in patient education is to assess and determine what specific information the patient needs to learn or understand regarding their treatment and self-care. This involves identifying gaps in knowledge, addressing concerns, and tailoring information to the patient's individual comprehension level. This foundational step ensures that teaching efforts are relevant and effective.

Question 16: What is the minimum recommended distance between the arterial and venous needles during AV fistula cannulation to minimize recirculation?

1 cm
2 cm
5 cm (Correct answer)
10 cm

Correct answer: 5 cm

Placing needles at least 5 cm (approximately 2 inches) apart prevents recirculation, which occurs when already-dialyzed blood is immediately re-drawn into the arterial needle. Recirculation reduces treatment adequacy and Kt/V.

Question 17: At the beginning of a hemodialysis treatment, which of the following assessments should the technician perform before initiating treatment?

Obtain vital signs only; weight can be measured after treatment is initiated
Obtain vital signs, pre-dialysis weight, assess vascular access, and review the treatment prescription (Correct answer)
Review the medication administration record only; clinical assessment is the nurse's responsibility
Obtain post-dialysis weight only since pre-dialysis weight was measured at last treatment

Correct answer: Obtain vital signs, pre-dialysis weight, assess vascular access, and review the treatment prescription

A comprehensive pre-treatment assessment includes vital signs (BP, HR, temperature, respirations), pre-treatment weight (to calculate ultrafiltration volume), vascular access assessment (bruit/thrill, appearance), and review of the treatment prescription to ensure all parameters are correct for that session.

Question 18: What does a failed pressure test during dialyzer reprocessing indicate?

A leak in the dialyzer membrane (Correct answer)
There is residual sterilant present
The dialyzer is excessively clotted
The TCV is too low for reuse

Correct answer: A leak in the dialyzer membrane

A pressure test, or leak test, checks the integrity of the hollow fiber membrane. If the dialyzer cannot hold a set pressure, it signifies a leak, which could allow non-sterile dialysate to mix with the patient's blood, posing a significant risk of infection and blood loss.

Question 19: What immediate action should a technician take upon discovering that a patient's needle has become dislodged and is bleeding under the skin (infiltration)?

Ignore if the patient reports only mild discomfort
Apply pressure over the infiltration and continue treatment at a lower blood flow rate
Stop the blood pump, clamp lines, remove needle, apply pressure, notify nurse, and assess patient hemodynamics (Correct answer)
Reinsert the needle at the same site and continue treatment

Correct answer: Stop the blood pump, clamp lines, remove needle, apply pressure, notify nurse, and assess patient hemodynamics

Needle infiltration requires immediately stopping the blood pump, removing the needle, and applying pressure to prevent hematoma expansion and assess for vascular injury.

Question 20: What is the recommended angle of needle insertion when cannulating a mature arteriovenous fistula?

5–10 degrees
90 degrees perpendicular to the skin
45–60 degrees
25–35 degrees (Correct answer)

Correct answer: 25–35 degrees

A 25–35 degree insertion angle allows the needle to enter the vessel lumen cleanly without going through the back wall. Shallower angles risk staying subcutaneous, while steeper angles increase the risk of posterior wall puncture and infiltration.

Question 21: What is the goal of dry weight assessment in hemodialysis patients?

To identify the post-dialysis weight at which the patient is euvolemic (normotensive without signs of fluid overload or depletion) (Correct answer)
To establish a baseline weight for calculating dialysis adequacy
To calculate the ideal protein intake based on lean body mass
To determine the minimum weight the patient can safely achieve before cardiovascular collapse

Correct answer: To identify the post-dialysis weight at which the patient is euvolemic (normotensive without signs of fluid overload or depletion)

Dry weight (also called target weight or estimated dry weight) is the post-dialysis weight at which the patient is euvolemic—blood pressure is controlled, there are no signs of fluid overload (edema, pulmonary congestion), and the patient does not experience hypotension or cramps.

Question 22: What is the primary role of carbon tanks in the dialysis water treatment system?

Adsorb chlorine and chloramines before water reaches the RO membrane (Correct answer)
Remove calcium and magnesium ions through ion exchange
Eliminate bacteria and endotoxins through UV irradiation
Filter out particulate matter larger than 5 microns

Correct answer: Adsorb chlorine and chloramines before water reaches the RO membrane

Carbon tanks use activated carbon to adsorb chlorine and chloramines from the feed water. These chemicals must be removed before the water contacts the reverse osmosis membrane, as they can degrade the membrane and, if they reach the patient, cause hemolytic anemia.

Question 23: What is the correct action if a patient's access site begins bleeding profusely during hemodialysis?

Increase heparin to prevent clotting
Ignore minor bleeding as it is common during dialysis
Apply a tourniquet and call for help
Apply direct pressure, alert the nurse/physician, and prepare to terminate treatment (Correct answer)

Correct answer: Apply direct pressure, alert the nurse/physician, and prepare to terminate treatment

Profuse bleeding from the access site requires immediate direct pressure, notification of the nurse and physician, and preparation to terminate treatment if bleeding cannot be controlled.

Question 24: What is the maximum allowable bacterial count in dialysis water per AAMI standards?

200 CFU/mL (action level 50 CFU/mL) (Correct answer)
10 CFU/mL (no action level)
1,000 CFU/mL (action level 500 CFU/mL)
100 CFU/mL (action level 10 CFU/mL)

Correct answer: 200 CFU/mL (action level 50 CFU/mL)

AAMI standards require dialysis water to have less than 200 CFU/mL of bacteria, with an action level of 50 CFU/mL. Exceeding the action level requires investigation and corrective action before results reach the maximum allowable limit.

Question 25: What is the purpose of rotating needle insertion sites on an AV fistula?

To prevent scarring and aneurysms (Correct answer)
To reduce bleeding
To avoid blood clots
To make the procedure easier

Correct answer: To prevent scarring and aneurysms

Rotating needle insertion sites prevents repeated trauma to the same area of the AV fistula. This practice reduces the risk of scarring, which can narrow the vessel, and the formation of aneurysms, which are dangerous bulges in the vessel wall. By distributing the insertion points, the fistula's integrity is maintained, prolonging its lifespan for effective dialysis.

Question 26: Which assessment finding during dialysis should prompt the technician to notify the nurse immediately?

Patient reports chest pain and shortness of breath (Correct answer)
Blood pump speed of 350 mL/min
UF rate of 500 mL/hr
Venous pressure of 120 mmHg

Correct answer: Patient reports chest pain and shortness of breath

Chest pain and shortness of breath during dialysis may indicate air embolism, cardiac event, hemolysis, or pulmonary edema, all emergencies requiring immediate nursing assessment.

Question 27: What is the correct initial management of a suspected air embolism during hemodialysis?

Clamp the venous line, place patient in left lateral decubitus Trendelenburg position, stop blood pump, call for help (Correct answer)
Increase blood pump speed to push air through the heart quickly
Place patient upright to allow air to rise and exit the pulmonary circulation
Continue treatment and monitor as small amounts of air are not clinically significant

Correct answer: Clamp the venous line, place patient in left lateral decubitus Trendelenburg position, stop blood pump, call for help

Left lateral decubitus Trendelenburg position traps air in the right atrium apex (away from pulmonary artery), while clamping the venous line and stopping the pump prevents further air entry.

Question 28: The primary purpose of the Health Insurance Portability and Accountability Act (HIPAA) is to:

Set standards for workplace safety.
Ensure proper billing and coding for Medicare.
Regulate the quality of dialysis care.
Protect the privacy and security of patient health information. (Correct answer)

Correct answer: Protect the privacy and security of patient health information.

HIPAA's Privacy Rule establishes national standards to protect individuals' medical records and other personal health information (PHI). It sets limits and conditions on the uses and disclosures of such information.

Question 29: Which chemical is most commonly used as the sterilant/disinfectant in modern dialyzer reprocessing systems?

Formaldehyde
Peracetic Acid (Correct answer)
Sodium Hypochlorite
Glutaraldehyde

Correct answer: Peracetic Acid

Peracetic acid (PAA) is a widely used high-level disinfectant and sterilant in dialyzer reprocessing. It is effective against a broad spectrum of microorganisms, including bacteria, viruses, and spores, and it breaks down into non-toxic byproducts (acetic acid and oxygen).

Question 30: A patient on erythropoiesis-stimulating agents (ESAs) has a hemoglobin of 13.5 g/dL during a routine check. What is the concern and appropriate action?

Hemoglobin is too low; increase ESA dose immediately
This level is ideal; continue current treatment
Hemoglobin of 13.5 is critical; transfuse immediately
Hemoglobin is above target; notify physician as ESA dose may need reduction to avoid thrombotic events (Correct answer)

Correct answer: Hemoglobin is above target; notify physician as ESA dose may need reduction to avoid thrombotic events

Hemoglobin above 13 g/dL in dialysis patients on ESAs is associated with increased risk of stroke, MI, and thrombosis; dose reduction or ESA hold is required.

Question 31: Which component of the dialysis machine is responsible for controlling the flow of blood through the dialyzer?

Blood pump (Correct answer)
Ultrafiltration pump
Dialysate pump
Air detector

Correct answer: Blood pump

The blood pump is the component of the dialysis machine responsible for drawing the patient's blood from their vascular access and propelling it through the extracorporeal circuit, including the dialyzer. It ensures a consistent and controlled flow rate, which is essential for efficient waste removal and fluid management during the dialysis treatment. Without the blood pump, blood would not circulate through the system.

Question 32: What is the primary purpose of sodium profiling during dialysis?

To stabilize blood pressure (Correct answer)
To reduce dialysate temperature
To increase fluid retention
To balance calcium levels

Correct answer: To stabilize blood pressure

Sodium profiling involves gradually decreasing the sodium concentration in the dialysate during treatment. This technique helps to prevent rapid shifts in fluid and electrolyte balance, which can cause intradialytic hypotension (low blood pressure) and muscle cramps. By stabilizing blood pressure, it improves patient tolerance and reduces adverse events during dialysis.

Question 33: A physician orders 5,000 units of heparin as a bolus for a 70 kg patient. The available concentration is 1,000 units/mL. How many mL should be administered?

5 mL (Correct answer)
0.5 mL
7 mL
1 mL

Correct answer: 5 mL

5,000 units ÷ 1,000 units/mL = 5 mL; accurate dose calculation is essential to prevent under- or over-anticoagulation.

Question 34: Proper labeling of a reprocessed dialyzer is crucial for patient safety. Which of the following pieces of information is required on the label?

The name of the technician who performed the reprocessing
The number of previous uses (Correct answer)
The brand of the reprocessing machine used
The patient's date of birth

Correct answer: The number of previous uses

The label on a reprocessed dialyzer must contain critical patient safety information to ensure it is used on the correct patient and is still safe for use. This includes the patient's name, the number of times it has been used, and the date of reprocessing.

Question 35: When teaching a patient about fluid restrictions, which item should be counted as part of their daily fluid allowance?

Rice cakes
Dry crackers
Hard candy
Gelatin/Jello (Correct answer)

Correct answer: Gelatin/Jello

Gelatin (Jello) is a liquid at room temperature and must be counted in the daily fluid allowance for dialysis patients.

Question 36: A technician notices the reuse count on a dialyzer has reached the facility's maximum allowed reuses. What is the correct action?

Discard the dialyzer and document the disposal (Correct answer)
Continue using the dialyzer if TCV is still within acceptable limits
Report to the nephrologist before discarding
Reprocess the dialyzer one additional time with double germicide concentration

Correct answer: Discard the dialyzer and document the disposal

When a dialyzer reaches the facility's maximum reuse count, it must be discarded regardless of TCV or visual appearance. The reuse limit is a safety boundary set by the facility based on manufacturer data, regulatory standards, and clinical policy.

Question 37: What is the primary mechanism by which a reverse osmosis (RO) system purifies dialysis water?

Forcing water through a semi-permeable membrane under pressure, rejecting 90–99% of dissolved solutes (Correct answer)
Activated carbon adsorption of heavy metals and ions
Ion exchange resin that traps dissolved minerals
Ultraviolet light that breaks down organic contaminants

Correct answer: Forcing water through a semi-permeable membrane under pressure, rejecting 90–99% of dissolved solutes

The RO system uses hydraulic pressure to push water through a semi-permeable membrane. The membrane's pore size is small enough to reject most dissolved ions, organics, bacteria, and endotoxins, producing highly purified product water while concentrating contaminants in a reject stream.

Question 38: If a new patient starts with a very high BUN, dialysis is purposely made less efficient to prevent:

excessive coagulation
dialysis disequilibrium syndrome (Correct answer)
rapid decrease in HCT
cardiac arrhythmia

Correct answer: dialysis disequilibrium syndrome

Dialysis disequilibrium syndrome (DDS) can occur when a patient with very high BUN undergoes rapid solute removal during dialysis. This rapid removal from the blood can cause a shift of fluid into the brain cells, leading to cerebral edema and neurological symptoms. By making dialysis less efficient initially, the rate of solute removal is slowed, allowing the body to adjust more gradually and preventing this dangerous complication.

Question 39: What is the clinical significance of a decreasing Kt/V trend over multiple treatments despite no changes in dialysis prescription?

Patient is improving and requires less dialysis
Normal variation that does not require investigation
May indicate access dysfunction, fistula recirculation, shortened treatment times, or increasing patient size (Correct answer)
The dialysis machine needs recalibration

Correct answer: May indicate access dysfunction, fistula recirculation, shortened treatment times, or increasing patient size

A declining Kt/V without prescription changes suggests access problems (stenosis, recirculation), non-compliance with treatment time, or patient body composition changes requiring evaluation.

Question 40: What does the term residual chloramine testing refer to and why must it be performed before every dialysis run?

Testing for calcium and magnesium residue from previous sessions
Testing for chloramines remaining in dialysate water that could cause hemolysis if present above 0.1 mg/L (Correct answer)
Testing for chemical residue left by dialyzer reprocessing agents
Testing for residual heparin in the blood lines

Correct answer: Testing for chloramines remaining in dialysate water that could cause hemolysis if present above 0.1 mg/L

Chloramines are added to municipal water for disinfection and can cause life-threatening hemolysis if not completely removed; testing before each run confirms adequate removal.

Question 41: What is the function of heparin in dialysis?

Aid in filtration
Lower blood pressure
Prevent clotting (Correct answer)
Increase dialysate flow

Correct answer: Prevent clotting

Heparin is an anticoagulant administered during hemodialysis to prevent blood from clotting within the extracorporeal circuit, which includes the bloodlines and dialyzer. Without heparin, the blood would clot in the tubing, rendering the treatment ineffective and potentially causing significant blood loss. It ensures a smooth and continuous flow of blood for efficient filtration.

Question 42: A patient's pre-dialysis serum bicarbonate is 14 mEq/L. What condition does this suggest and what is the appropriate response?

Metabolic acidosis; consider increasing dialysate bicarbonate concentration and notify the care team (Correct answer)
Normal finding in dialysis patients; no action needed
Metabolic alkalosis; reduce dialysate bicarbonate concentration
Respiratory acidosis; prepare for non-invasive ventilation

Correct answer: Metabolic acidosis; consider increasing dialysate bicarbonate concentration and notify the care team

A serum bicarbonate of 14 mEq/L is significantly below the target range of 22–26 mEq/L for dialysis patients, indicating metabolic acidosis. This should be communicated to the care team for consideration of higher dialysate bicarbonate concentration or other interventions.

Question 43: What is the function of the distribution loop in the dialysis water treatment system?

To distribute backwash water from the RO reject stream to the floor drains
To recirculate used dialysate back through the RO system for reuse
To continuously circulate RO-purified water to dialysis machines, preventing stagnation and bacterial growth in supply lines (Correct answer)
To distribute concentrated electrolytes from the proportioning system to individual dialysis machines

Correct answer: To continuously circulate RO-purified water to dialysis machines, preventing stagnation and bacterial growth in supply lines

The distribution loop continuously circulates RO product water through the supply lines to all dialysis machines. Continuous circulation prevents water from becoming stagnant in the lines, which would allow bacterial biofilm to form and multiply in the piping system.

Question 44: What is the recommended hand hygiene technique after removing gloves following patient care in a hemodialysis unit?

Only wash hands if gloves visibly tore during use
Sanitize gloves and remove them over the sink
Wash hands with soap and water or use alcohol-based hand rub immediately after glove removal (Correct answer)
Gloves provide complete protection; hand hygiene is optional after removal

Correct answer: Wash hands with soap and water or use alcohol-based hand rub immediately after glove removal

Hands must be washed or sanitized immediately after removing gloves because gloves can have micro-tears and removal itself can contaminate hands.

Question 45: The Urea Reduction Ratio (URR) is a primary method used to measure:

The patient's nutritional status.
The level of fluid overload.
The patient's interdialytic weight gain.
The adequacy of a hemodialysis treatment. (Correct answer)

Correct answer: The adequacy of a hemodialysis treatment.

URR calculates the percentage of urea removed during a single dialysis session by comparing pre- and post-dialysis BUN levels. A URR of 65% or greater is the minimum acceptable standard, indicating adequate treatment.

Question 46: A patient begins to experience shortness of breath, itching, and hives within the first 15 minutes of treatment. The technician should suspect which complication?

Disequilibrium syndrome
Air embolism
Hemolysis
Anaphylactic reaction (Correct answer)

Correct answer: Anaphylactic reaction

These are classic signs of a severe allergic or anaphylactic reaction, which can be life-threatening. Common causes include reactions to the dialyzer membrane, sterilants, or medications. The treatment must be stopped immediately, and emergency protocols initiated.

Question 47: The technician finds that the total chlorine level in the water is 1.1 parts per million (ppm) and the free chlorine level is 0.9 ppm while testing for the presence of chloramine. As a result, the amount of chloramine is ____________.

0.2 ppm. (Correct answer)
0.4 ppm.
4.0 ppm.
2.0 ppm.

Correct answer: 0.2 ppm.

Chloramine can be combined with ammonia to create a long-acting form of chlorine; it cannot be measured directly, but the chloramine level can be calculated by deducting the free chlorine from the total chlorine: If, when testing water for the level of chloramine, the technician finds that the total chlorine level is 1.1 parts per million (ppm) and the free chlorine level is 0.9 ppm, the chloramine level is 0.2 ppm. 1.1 - 0.9 is equal to 0.2 ppm, or 0.2 mg/L. The dialysis chloramine limit is 0.1 mg/L.

Question 48: Which parameter is most critical to monitor during a dialysis session?

Blood pressure (Correct answer)
Room temperature
Patient weight
Water pressure

Correct answer: Blood pressure

Blood pressure is the most critical parameter to monitor because rapid fluid removal during dialysis can cause significant drops, leading to hypotension, dizziness, and fainting. Maintaining stable blood pressure is vital for patient safety and comfort, preventing complications like organ hypoperfusion. Frequent monitoring allows for timely interventions, such as adjusting ultrafiltration or administering saline, to stabilize the patient.

Question 49: How do you assess the adequacy of dialysis?

Through clinical measures and lab tests (Correct answer)
By checking the dialysis machine settings
By patient feedback on comfort
By monitoring blood pressure changes

Correct answer: Through clinical measures and lab tests

The adequacy of dialysis is primarily assessed through objective clinical measures and laboratory tests. Clinical assessments include evaluating the patient's fluid status, blood pressure, and overall well-being, while lab tests such as the Urea Reduction Ratio (URR) and Kt/V provide quantitative data on how effectively waste products like urea are being removed from the blood. Patient feedback, while important for comfort, is subjective and not the main indicator of treatment efficacy.

Question 50: A hemodialysis patient's monthly labs show serum potassium of 6.8 mEq/L. What is the most urgent concern?

Risk of fatal cardiac arrhythmias (Correct answer)
Increased risk of muscle cramps during dialysis
Development of metabolic acidosis
Worsening renal bone disease

Correct answer: Risk of fatal cardiac arrhythmias

Hyperkalemia (potassium >6.5 mEq/L) poses an immediate risk of life-threatening cardiac arrhythmias including ventricular fibrillation and asystole. This is the most urgent clinical concern and requires prompt intervention including dietary restriction, dialysate potassium adjustment, and possibly emergency dialysis.

Question 51: What is the purpose of the dialyzer in the dialysis machine?

To remove toxins and fluid from blood (Correct answer)
To monitor blood pressure
To detect air in the blood
To administer medications

Correct answer: To remove toxins and fluid from blood

The dialyzer, often referred to as the artificial kidney, is the core component where the actual purification of blood takes place. It contains a semi-permeable membrane that allows waste products and excess fluid to pass from the patient's blood into the dialysate solution, while retaining essential blood cells and proteins. This process mimics the natural filtering function of healthy kidneys.

Question 52: Which of the following is most likely to increase the efficacy of hemodialysis in a dialysis patient who is very large in both stature and weight?

Change to peritoneal dialysis.
Increase dialyzer size. (Correct answer)
Decrease treatment time.
Increase salt restriction.

Correct answer: Increase dialyzer size.

An increase in the dialyzer size because it promotes the clearance of waste products is the intervention that is most likely to improve hemodialysis effectiveness in patients who are very large in both stature and weight. Based on the patient's size and the recommended length of treatment, the nephrologist determines the size of the dialyzer. Increasing the length of treatment is another technique that can improve the efficacy of hemodialysis.

Question 53: What does a positive Tinel's sign at the wrist suggest in a long-term hemodialysis patient with an upper arm access?

Early signs of vascular access stenosis
Carpal tunnel syndrome, commonly caused by beta-2 microglobulin amyloid deposits (Correct answer)
Good arterial blood flow through the fistula
Normal neurological function

Correct answer: Carpal tunnel syndrome, commonly caused by beta-2 microglobulin amyloid deposits

Tinel's sign (tingling when tapping the carpal tunnel) suggests carpal tunnel syndrome, which is common in long-term dialysis patients due to beta-2 microglobulin amyloid deposition.

Question 54: How frequently should dialysate conductivity be checked?

Before each treatment (Correct answer)
Once weekly
At the beginning of each shift
Only if a problem occurs

Correct answer: Before each treatment

Dialysate conductivity must be checked before each treatment to ensure the solution's chemical composition is correct and safe for the patient. Incorrect conductivity can lead to severe electrolyte imbalances, such as hypernatremia or hyponatremia, which can cause serious complications. This routine check is a vital safety measure to prevent adverse patient reactions.

Question 55: What is the minimum frequency required by CMS for reviewing and updating the dialysis patient care plan?

Every 6 months (semi-annually)
Every 3 months (quarterly) (Correct answer)
Monthly
Annually

Correct answer: Every 3 months (quarterly)

CMS Conditions for Coverage require that each dialysis patient's individualized care plan be reviewed and updated at least quarterly (every 3 months) by the interdisciplinary team. More frequent updates are required when there is a significant change in the patient's condition.

Question 56: At minimum, how frequently should dialysis water be tested for bacteriological contamination according to AAMI guidelines?

Weekly
Quarterly
Daily
Monthly (Correct answer)

Correct answer: Monthly

AAMI guidelines require bacteriological testing of dialysis water at least once per month. Monthly monitoring ensures that any microbial growth in the distribution loop or storage tank is detected before bacterial counts rise to levels that could cause patient infections or pyrogenic reactions.

Question 57: The reason potassium dialyzes and RBCs do not is:

RBCs have a negative charge
potassium has a smaller molecular weight (Correct answer)
RBCs are not water-soluble
potassium has a larger molecular weight

Correct answer: potassium has a smaller molecular weight

Dialysis works on the principle of diffusion, where solutes move across a semipermeable membrane. The size of the molecule is a critical factor in this process. Smaller molecules like potassium ions can easily pass through the pores of the dialyzer membrane, while much larger components like red blood cells (RBCs) cannot, ensuring that RBCs remain in the patient's blood.

Question 58: How should a dialysis technician respond if blood flow from a newly cannulated AVF immediately reads -250 mmHg arterial pressure at a blood pump speed of only 200 mL/min?

Switch to the venous needle as the arterial access
Reduce pump speed to 100 mL/min, assess needle position, check for needle in graft wall or positional issues, and notify the nurse (Correct answer)
Increase the pump speed to overcome the resistance
Accept -250 mmHg as normal for new fistulas

Correct answer: Reduce pump speed to 100 mL/min, assess needle position, check for needle in graft wall or positional issues, and notify the nurse

Excessively negative arterial pressure at low blood pump speed indicates a problem with blood delivery: needle malposition, kinked line, inadequate access, or access stenosis.

Question 59: What should be done if a needle stick injury occurs during dialysis?

Ignore the injury if it's minor
Continue with dialysis treatment
Use antiseptic on the injury
Wash the area and report the incident (Correct answer)

Correct answer: Wash the area and report the incident

A needle stick injury is a serious occupational hazard that carries a risk of transmitting bloodborne pathogens. The immediate action is to wash the affected area thoroughly with soap and water, followed by prompt reporting of the incident to supervisors. This allows for proper medical evaluation, post-exposure prophylaxis if necessary, and incident documentation to ensure worker safety.

Question 60: How long can a reprocessed dialyzer typically be stored before it must be used or discarded?

24 hours
3 days
14 days
7 days (Correct answer)

Correct answer: 7 days

Most reprocessed dialyzers filled with germicide have a storage life of 7 days. After this period, the germicide may have degraded below effective concentrations, potentially allowing microbial growth inside the dialyzer.

Question 61: What is the significance of tracking vascular access types in a dialysis facility's quality program?

Access type data is only important for billing purposes
AVF use rates reflect best practice adherence; facilities track AV fistula placement to reduce infection-prone catheters (Correct answer)
Graft use is preferred and should be maximized
Access type has no impact on patient outcomes

Correct answer: AVF use rates reflect best practice adherence; facilities track AV fistula placement to reduce infection-prone catheters

Higher AVF rates are associated with lower infection rates and mortality; the CMS QIP tracks AVF and catheter rates as quality performance measures.

Question 62: What is the immediate action a hemodialysis technician should take if a blood leak is detected in the dialysate circuit?

Flush the bloodlines with saline and resume treatment
Replace the dialysate bag and continue treatment
Increase the ultrafiltration rate to compensate
Clamp the blood lines and notify the nurse immediately (Correct answer)

Correct answer: Clamp the blood lines and notify the nurse immediately

Detection of a blood leak (blood crossing from the blood compartment into the dialysate) requires immediate clamping of blood lines and notification of the nurse. Treatment must be stopped because blood loss and potential dialysate contamination pose serious risks to the patient.

Question 63: Which type of hemodialysis vascular access carries the highest risk of bloodstream infection?

Subcutaneous port-catheter device
Tunneled cuffed central venous catheter (Correct answer)
Native arteriovenous fistula
Synthetic arteriovenous graft

Correct answer: Tunneled cuffed central venous catheter

Tunneled cuffed central venous catheters (CVCs) have the highest infection risk among hemodialysis accesses because the catheter provides a direct conduit from the skin surface into the central venous system, bypassing natural skin and vascular barriers. Native AV fistulas have the lowest infection rates and are the preferred access.

Question 64: What type of water quality testing documents are required to be maintained in the dialysis facility?

Water test results are maintained only by the water treatment vendor and not required on-site
Daily chlorine/chloramine logs, monthly bacteriology and endotoxin results, and annual chemical analysis, retained for at least 2 years (Correct answer)
Only the annual state inspection water quality report is required
Only monthly bacteriology reports are required by CMS

Correct answer: Daily chlorine/chloramine logs, monthly bacteriology and endotoxin results, and annual chemical analysis, retained for at least 2 years

Facilities must maintain comprehensive water quality records including daily chlorine/chloramine logs, monthly microbiological results (bacteria and endotoxins), and annual chemical analysis for all AAMI-required contaminants. CMS Conditions for Coverage require these records to be retained and available for surveyor review.

Question 65: Salt replacements should not be used by hemodialysis patients because they frequently ____________.

cause nausea.
contain potassium. (Correct answer)
cause constipation.
taste bad.

Correct answer: contain potassium.

Since high potassium intake is risky, patients getting hemodialysis should be counseled to stay away from salt substitutes, which frequently exchange potassium for some of the sodium. When a replacement is advertised as "sodium free," it is typically entirely made of potassium. Patients can be urged to experiment with using various herbs or lemon juice in place of salt. While Mrs. Dash® products lack sodium or potassium, they do contain mixtures of other herbs and spices.

Question 66: Before returning a reprocessed dialyzer to a patient, which test must be performed to ensure patient safety?

Blood leak detector calibration
Dialysate conductivity test
Ultrafiltration coefficient verification
Germicide residual test (Correct answer)

Correct answer: Germicide residual test

A germicide residual test must be performed to confirm that germicide levels in the dialyzer are below the safe threshold before use. Exposing a patient to residual germicide can cause serious adverse reactions including hemolysis and cardiovascular compromise.

Question 67: A patient's serum sodium is 128 mEq/L before dialysis. The dialysate sodium is 138 mEq/L. What is the expected effect on sodium balance?

No change because sodium does not cross dialysis membranes
Sodium will be added to the blood from dialysate, raising serum sodium toward normal (Correct answer)
Potassium will rise to compensate for low sodium
Sodium will decrease further as dialysis removes sodium preferentially

Correct answer: Sodium will be added to the blood from dialysate, raising serum sodium toward normal

With dialysate sodium (138) higher than serum sodium (128), diffusion moves sodium from dialysate into blood, correcting hyponatremia.

Question 68: What is the recommended approach when a patient's arterial pressure alarm activates with a very negative reading (e.g., -250 mmHg)?

Stop treatment and remove the patient immediately
Increase the blood pump speed to overcome the resistance
Ignore it if the patient feels fine
Reduce the blood pump speed and check for arterial access problems (Correct answer)

Correct answer: Reduce the blood pump speed and check for arterial access problems

Extremely negative arterial pressure indicates inadequate blood flow from the access; reducing pump speed and assessing the arterial needle or access helps identify and correct the problem.

Question 69: You test for sterilant levels in a hemodialysis machine prior to patient use. The test is positive for sterilant. This means the machine:

needs further rinsing (Correct answer)
is sterile & bacteria-free
is in conductivity
needs more sterilant

Correct answer: needs further rinsing

A positive test for sterilant indicates that residual sterilizing chemicals are still present in the machine. These chemicals are toxic and can cause severe adverse reactions if they enter the patient's bloodstream during dialysis. Therefore, the machine requires thorough rinsing to remove all traces of the sterilant before it can be safely connected to a patient.

Question 70: What should you check after dialysis has finished?

Ensure the patient is stable
All of the above (Correct answer)
Dispose of dialysis equipment
Check for signs of bleeding (Correct answer)

Correct answer: All of the above

After dialysis has finished, it is critically important to check for signs of bleeding, particularly at the vascular access site. Anticoagulants used during the treatment can increase the risk of post-dialysis bleeding. While ensuring patient stability and proper equipment disposal are also important, actively monitoring for bleeding is a direct safety measure to prevent immediate complications.

Question 71: What is the appropriate intervention for a patient with signs of an allergic reaction during dialysis?

Give heparin
Slow blood pump
Stop dialysis and notify nurse (Correct answer)
Continue monitoring only

Correct answer: Stop dialysis and notify nurse

If a patient shows signs of an allergic reaction during dialysis, the immediate and appropriate intervention is to stop dialysis and notify the nurse or physician. Allergic reactions can rapidly escalate to severe anaphylaxis, requiring prompt cessation of exposure to the suspected allergen and immediate medical intervention. Continuing treatment could worsen the patient's condition.

Question 72: During hemodialysis, the blood pump suddenly stops and the venous pressure alarm activates. What is the most likely cause?

Inadequate heparin dosing
Air in the blood lines
Low dialysate temperature
Clotting in the venous needle or access (Correct answer)

Correct answer: Clotting in the venous needle or access

A sudden increase in venous pressure with blood pump stoppage typically indicates a clot or obstruction in the venous return pathway.

Question 73: Which laboratory value most directly reflects a patient's dialysis adequacy and should guide treatment adjustments?

Serum phosphorus level
Kt/V (urea clearance index) (Correct answer)
Hemoglobin concentration
Serum creatinine level

Correct answer: Kt/V (urea clearance index)

Kt/V is the standard measure of dialysis adequacy, reflecting the volume of blood cleared of urea relative to the patient's body water volume.

Question 74: A patient with a forearm loop AVG has an area of thinned, shiny skin directly over the graft material. What is the clinical concern and appropriate action?

Risk of spontaneous graft rupture or erosion; do not cannulate the area and refer immediately to vascular surgery (Correct answer)
This indicates good incorporation of the graft; proceed with cannulation
Apply topical antibiotic ointment and continue cannulating the area
Normal skin changes over synthetic graft material; document and monitor

Correct answer: Risk of spontaneous graft rupture or erosion; do not cannulate the area and refer immediately to vascular surgery

Skin erosion or thinning over an AVG indicates the graft is eroding through the skin, a surgical emergency; the graft must not be cannulated and immediate surgical evaluation is required.

Question 75: A hemodialysis patient's pre-dialysis labs show sodium of 136 mEq/L, but the patient reports drinking 3 liters of fluid since their last treatment. How does this help interpret their fluid status?

Normal sodium indicates that dietary sodium restriction is unnecessary
Sodium does not help assess fluid status—use weight instead
The high fluid intake relative to sodium suggests dilutional hyponatremia is developing or the patient has significant interdialytic fluid gain (Correct answer)
The normal sodium confirms the patient is not volume overloaded

Correct answer: The high fluid intake relative to sodium suggests dilutional hyponatremia is developing or the patient has significant interdialytic fluid gain

When a patient consumes a large fluid volume and serum sodium appears normal (or low), this suggests a dilutional process—excess water ingestion has diluted both sodium and other solutes. In dialysis patients, this pattern indicates significant interdialytic fluid gain requiring aggressive ultrafiltration and potentially dietary sodium and fluid counseling.

Question 76: Why is hyperphosphatemia particularly dangerous for hemodialysis patients beyond the known bone disease effects?

It reduces EPO effectiveness, worsening anemia
It directly impairs the dialyzer membrane
It promotes vascular and soft tissue calcification, increasing cardiovascular mortality (Correct answer)
It directly causes cardiac arrhythmias

Correct answer: It promotes vascular and soft tissue calcification, increasing cardiovascular mortality

Elevated phosphorus combines with calcium to form calcium-phosphate deposits in blood vessels and soft tissues (vascular calcification), dramatically increasing cardiovascular risk.

Question 77: What is the minimum acceptable total cell volume (TCV) for a reprocessed dialyzer to be approved for reuse?

80% of the original TCV (Correct answer)
95% of the original TCV
70% of the original TCV
90% of the original TCV

Correct answer: 80% of the original TCV

AAMI guidelines require that a reprocessed dialyzer retain at least 80% of its original total cell volume (TCV). A dialyzer that falls below this threshold must be discarded because reduced fiber volume indicates inadequate clearance capability.

Question 78: When setting up the extracorporeal circuit, why is it important to prime the blood lines with saline before connecting to the patient?

Saline pre-heparinizes the circuit
Priming removes air from the circuit and tests for leaks before blood enters (Correct answer)
Saline warms the tubing to body temperature
Priming activates the dialyzer membrane

Correct answer: Priming removes air from the circuit and tests for leaks before blood enters

Priming removes air bubbles from blood lines and the dialyzer, and allows visual inspection for leaks or defects before the patient is connected.

Question 79: Which of the following non-prescription remedies might help treat symptoms if a patient complains of chronic itching?

Apply rubbing alcohol.
Avoid bathing.
Take cold showers.
Take oatmeal baths. (Correct answer)

Correct answer: Take oatmeal baths.

Taking oatmeal baths can help to calm the skin and alleviate itching if a patient complains of recurrent itching. Maintaining healthy skin moisture (with products like Aveeno® or Cetaphil®) may also be beneficial. For the majority of kidney dialysis users, itching is a concern. Patients who are itching should always be evaluated by the nurse. Hyperparathyroidism may cause itching, thus treating it may assist with symptoms. Phosphate binders could be helpful if the patient has too much phosphorus in their system.

Question 80: What is the recommended needle gauge range for cannulating a mature arteriovenous fistula for standard hemodialysis?

17–16 gauge (Correct answer)
20–22 gauge
25 gauge
14–15 gauge

Correct answer: 17–16 gauge

Standard AV fistula and graft cannulation for hemodialysis uses 15–17 gauge needles. The 16-gauge needle is most commonly used for blood flow rates of 300–400 mL/min, balancing adequate blood flow with minimizing vessel trauma.

Question 81: Which iron preparation is commonly administered intravenously during hemodialysis sessions to treat iron deficiency anemia?

Vitamin B12 injection
Ferric citrate oral tablet
Iron sucrose (Correct answer)
Oral ferrous sulfate

Correct answer: Iron sucrose

Iron sucrose is a commonly used IV iron formulation that can be administered during hemodialysis to replenish iron stores.

Question 82: What is the purpose of the deaeration chamber system in a hemodialysis machine?

Cool the dialysate to proper temperature
Remove dissolved gases from dialysate before patient contact (Correct answer)
Measure dialysate flow rate
Remove bacteria from dialysate

Correct answer: Remove dissolved gases from dialysate before patient contact

The deaeration system removes dissolved gases (primarily CO2 and O2) from dialysate to prevent microbubble formation that could damage the dialyzer membrane.

Question 83: What is the recommended action if there is an air embolism during dialysis?

Increase blood flow rate
Place the patient in Trendelenburg position (Correct answer)
Continue dialysis
Administer oxygen

Correct answer: Place the patient in Trendelenburg position

In the event of an air embolism during dialysis, placing the patient in the Trendelenburg position (head down, feet up) on their left side is a critical intervention. This position helps to trap air in the right ventricle, preventing it from entering the pulmonary circulation and reducing the risk of air traveling to the brain or lungs, allowing time for the air to be absorbed or aspirated.

Question 84: What is the role of the CCHT in preventing wrong patient, wrong treatment errors in the dialysis unit?

Only the charge nurse is responsible for patient identification
Patient identification is only checked at the first treatment
Verify patient identity with two identifiers before every treatment and confirm treatment prescription matches the patient (Correct answer)
Ask the patient their name at the beginning of treatment only

Correct answer: Verify patient identity with two identifiers before every treatment and confirm treatment prescription matches the patient

The CCHT must verify patient identity using two identifiers (name + DOB or ID number) before every treatment to prevent wrong-patient errors.

Question 85: What is the role of the ultrafiltration pump in dialysis?

To prevent blood clots
To monitor the patient's blood pressure
To increase blood flow
To remove excess fluid from blood (Correct answer)

Correct answer: To remove excess fluid from blood

The ultrafiltration pump plays a specific role in dialysis by precisely controlling the rate at which excess fluid is removed from the patient's blood. By creating a pressure gradient across the dialyzer membrane, it ensures that the correct amount of water is extracted, preventing fluid overload and its associated complications like hypertension and pulmonary edema.

Question 86: Substances that form ions (charged particles) are __________.

enzymes
amino acids
electrolytes (Correct answer)
hormones

Correct answer: electrolytes

Electrolytes are substances that, when dissolved in water, dissociate into ions (electrically charged particles). These ions are crucial for various bodily functions, including nerve impulses, muscle contractions, and maintaining fluid balance. They play a vital role in cellular processes and overall physiological stability.

Question 87: The technician may divulge his or her password to ____________ if a dialysis facility uses electronic charting.

nurse.
no one. (Correct answer)
supervisor.
nephrologist.

Correct answer: no one.

When computerized charting is used at a dialysis facility, the technician shouldn't divulge their password to anyone. Each staff member who is permitted to access a patient's or patients' electronic health record should have their own password. According to the user's password, access to the records is electronically monitored. A staff member should never have access to the files of a patient for whom they are not providing care because doing so is against the Health Insurance Portability and Accountability Act of 1996.

Question 88: How does single-needle dialysis differ from standard two-needle hemodialysis?

It uses one needle for access and relies on peritoneal membranes for diffusion
It is only used for patients with central venous catheters
It alternates blood withdrawal and return through a single needle using a dual-lumen approach (Correct answer)
It requires a higher blood flow rate to compensate for single access

Correct answer: It alternates blood withdrawal and return through a single needle using a dual-lumen approach

Single-needle dialysis uses one needle or dual-lumen catheter, alternating between drawing blood out and returning it, reducing efficiency compared to standard two-needle access.

Question 89: If a patient comes for hemodialysis treatment but weighs less than the target dry weight before treatment, the technician should ______________.

continue with the dialysis treatment
advise the patient to eat more
slow the ultrafiltration rate
notify the nurse and dietician (Correct answer)

Correct answer: notify the nurse and dietician

If a patient weighs less than their target dry weight before treatment, it indicates potential dehydration or significant fluid loss, which could lead to complications like hypotension during dialysis. The technician must notify the nurse, who can assess the patient's clinical status and determine if adjustments to the treatment plan are needed. The dietician may also be involved to assess nutritional intake and fluid management, ensuring patient safety and appropriate care.

Question 90: What is the primary purpose of the softener in the dialysis water treatment system?

To remove calcium and magnesium ions to prevent scaling and protect the reverse osmosis membrane (Correct answer)
To remove chlorine and chloramines from the water supply
To adjust the pH of the water to dialysate range
To eliminate bacteria and endotoxins from the water

Correct answer: To remove calcium and magnesium ions to prevent scaling and protect the reverse osmosis membrane

The water softener exchanges calcium and magnesium ions (which cause 'hardness') for sodium ions using a cation exchange resin. This prevents scaling and mineral deposit buildup in pipes, the reverse osmosis membrane, and dialysis machines.

Question 91: What is the primary function of the bicarbonate proportioning system in modern hemodialysis machines?

Control the rate of potassium removal from blood
Sterilize the dialysate before patient contact
Monitor and adjust patient's serum bicarbonate levels directly
Mix acid and bicarbonate concentrates with purified water to create dialysate (Correct answer)

Correct answer: Mix acid and bicarbonate concentrates with purified water to create dialysate

The proportioning system precisely mixes acid concentrate (containing electrolytes) and bicarbonate concentrate with purified water in correct ratios to create dialysate.

Question 92: What action should a technician take if the air detector alarm activates during hemodialysis?

Remove the patient from the circuit gently
Silence the alarm and continue treatment
Clamp the venous line and stop the blood pump immediately (Correct answer)
Increase the blood pump speed

Correct answer: Clamp the venous line and stop the blood pump immediately

An air detector alarm requires immediate clamping of the venous blood line and stopping the blood pump to prevent air embolism.

Question 93: As part of anemia management for patients receiving hemodialysis, the technician should ___________.

encourage patients to have short treatments
provide patients with high-calorie snacks
keep statistics regarding the number of anemic patients
rinse back as much blood as possible (Correct answer)

Correct answer: rinse back as much blood as possible

Anemia is a common and serious complication for hemodialysis patients due to various factors, including blood loss during treatment. By thoroughly rinsing back all blood from the dialyzer and blood lines at the end of a session, technicians minimize the amount of blood lost. This practice is crucial for conserving the patient's red blood cell count and supporting anemia management.

Question 94: The technician's permitted responsibilities mostly depend on the ______.

state regulations/standards of practice. (Correct answer)
technician’s training.
Centers for Medicare & Medicaid Services guidelines.
dialysis center guidelines.

Correct answer: state regulations/standards of practice.

The tasks that the technician is permitted to perform are generally governed by state laws and professional norms of conduct. Despite the fact that trained technicians should get comparable training, several states forbid cannulating accesses and giving intravenous heparin to technicians. Always be aware of what is legal in the state where you are working, as a technician. Even if a state permits a technician to perform specific tasks (such giving heparin injections), a dialysis facility may further limit the technician's function.

Question 95: In a hemodialysis patient, which combination of laboratory findings is most consistent with iron deficiency anemia?

Low ferritin, high TSAT, normal hemoglobin
Low ferritin (<100 ng/mL), low TSAT (<20%), low hemoglobin, low MCV (Correct answer)
High ferritin, high transferrin saturation (TSAT), low hemoglobin
Normal ferritin, normal TSAT, low hemoglobin, normal MCV

Correct answer: Low ferritin (<100 ng/mL), low TSAT (<20%), low hemoglobin, low MCV

Iron deficiency anemia is characterized by depleted iron stores (low ferritin), insufficient iron for transport to the marrow (low TSAT), reduced hemoglobin synthesis (low hemoglobin), and small red cells (low MCV—microcytic anemia) from inadequate hemoglobin to fill each cell.

Question 96: A dialyzer arrives at the reprocessing area and is found to have a crack in the header cap. What is the correct action?

Repair the crack with medical-grade adhesive before reprocessing
Discard the dialyzer immediately without reprocessing (Correct answer)
Reprocess the dialyzer if TCV and pressure tests are within normal limits
Quarantine the dialyzer and notify the supervisor for assessment

Correct answer: Discard the dialyzer immediately without reprocessing

A cracked header cap compromises the structural integrity of the dialyzer and creates a potential pathway for contamination and blood leakage. The dialyzer must be discarded immediately—no reprocessing is appropriate for a physically damaged dialyzer.

Question 97: Infections in buttonhole tracts are almost always caused by ___________.

poor skin preparation
improper scab removal (Correct answer)
contaminated hands
incorrect cannulation technique

Correct answer: improper scab removal

Infections in buttonhole tracts are most commonly caused by improper or incomplete scab removal before cannulation. If scabs are not thoroughly removed, they can be pushed into the tract during needle insertion, introducing bacteria directly into the bloodstream. Proper cleaning and meticulous scab removal are critical steps to prevent these infections and ensure patient safety.

Question 98: Which reagent is used in the standard colorimetric test to check for free chlorine residual in dialysis water?

Orthotoluidine
DPD (N,N-diethyl-p-phenylenediamine) (Correct answer)
Phenolphthalein
Sodium thiosulfate

Correct answer: DPD (N,N-diethyl-p-phenylenediamine)

DPD reacts with free chlorine to produce a pink-to-red color, allowing a rapid and accurate colorimetric measurement. It is the AAMI-recommended method for verifying that carbon tank effluent meets the safe chlorine limit (≤0.1 mg/L) before dialysis begins.

Question 99: A patient develops hypotension (BP 80/50) during dialysis with associated diaphoresis and pallor. After stopping ultrafiltration, what is the next immediate intervention?

Administer antihypertensive medications to stabilize BP
Increase blood pump speed to improve cardiac output
Administer 25% albumin solution
Place patient in Trendelenburg position and administer a normal saline bolus (Correct answer)

Correct answer: Place patient in Trendelenburg position and administer a normal saline bolus

Trendelenburg positioning (legs elevated) increases venous return to the heart, and saline bolus rapidly expands intravascular volume to treat dialysis-induced hypotension.

Question 100: What is the function of a deionizer (DI unit) in a dialysis water treatment system?

Reduce water pressure to a safe level before it enters the RO membrane
Exchange cations and anions in water for hydrogen and hydroxyl ions, producing highly purified water (Correct answer)
Kill microorganisms by exposing water to high-intensity ultraviolet light
Remove residual chlorine through catalytic reduction

Correct answer: Exchange cations and anions in water for hydrogen and hydroxyl ions, producing highly purified water

A deionizer contains mixed-bed ion exchange resin that replaces dissolved cations (e.g., sodium, calcium) with H⁺ ions and dissolved anions (e.g., chloride, sulfate) with OH⁻ ions. The H⁺ and OH⁻ combine to form water, removing nearly all ionic contamination. Resistivity or conductivity monitoring indicates when the resin is exhausted.

Question 101: What does the conductivity monitor on a hemodialysis machine measure, and why is it critical?

Pressure in the venous blood line
Flow rate of dialysate through the circuit
Temperature of the blood returning to the patient
Concentration of electrolytes in the dialysate solution (Correct answer)

Correct answer: Concentration of electrolytes in the dialysate solution

Conductivity measures the total ionic concentration (electrolyte content) of the dialysate, ensuring the correct concentration for safe treatment.

Question 102: Which parameter must be verified before connecting a patient to the hemodialysis machine?

The machine's last service date
The dialysate color and turbidity
Blood flow rate, dialysate flow rate, temperature, and conductivity (Correct answer)
The patient's hemoglobin level

Correct answer: Blood flow rate, dialysate flow rate, temperature, and conductivity

All dialysis prescription parameters must be verified against the patient's prescription before treatment begins.

Question 103: Which member of the hemodialysis care team is responsible for setting up the plan of care for a patient?

Patient
Nurse
Social worker
Nephrologist (Correct answer)

Correct answer: Nephrologist

The nephrologist is the physician specializing in kidney diseases and is ultimately responsible for diagnosing, treating, and managing the overall medical care of hemodialysis patients. This includes prescribing the dialysis treatment parameters, medications, and developing the comprehensive plan of care. While other team members contribute significantly, the nephrologist holds the primary medical authority for the patient's treatment plan.

Question 104: What is the purpose of testing dialysis water for endotoxins?

To confirm the water is free of aluminum and heavy metals
To measure the total dissolved solids that might interfere with dialysate mixing
To detect bacterial cell wall fragments that can cause inflammatory reactions even in the absence of live bacteria (Correct answer)
To assess the effectiveness of chloramine removal by the carbon tanks

Correct answer: To detect bacterial cell wall fragments that can cause inflammatory reactions even in the absence of live bacteria

Endotoxins are lipopolysaccharides derived from gram-negative bacterial cell walls. Even dead bacteria release endotoxins. When endotoxins enter the bloodstream via the dialysate, they trigger immune responses causing fever, hypotension, and systemic inflammation—even without live bacterial infection.

Question 105: A dialysis technician witnesses a co-worker falsifying a treatment record by entering a blood flow rate that was not actually achieved. What is the appropriate action?

Confront the co-worker directly and give them an opportunity to correct the record first
Report the falsification to the supervisor or through the facility's compliance reporting mechanism (Correct answer)
Document the observation in the patient's chart alongside the falsified entry
Correct the record personally to protect patient safety without involving management

Correct answer: Report the falsification to the supervisor or through the facility's compliance reporting mechanism

Falsification of medical records is fraud and a serious patient safety issue—inaccurate blood flow rate documentation could mask inadequate dialysis delivery (low Kt/V). The correct action is to report the incident to a supervisor or through the facility's compliance/ethics reporting system.

Question 106: Which of the following best describes the purpose of pressure testing a dialyzer during reprocessing?

To verify membrane integrity and detect fiber bundle leaks (Correct answer)
To check the blood pump segment for cracks
To measure ultrafiltration rate
To confirm the dialysate flow path is patent

Correct answer: To verify membrane integrity and detect fiber bundle leaks

Pressure testing during reprocessing verifies the integrity of the dialyzer membrane. A drop in pressure indicates that fibers are broken or leaking, which would allow blood and dialysate to mix during treatment—a serious patient safety risk.

Question 107: Which AAMI standard specifically governs dialyzer reprocessing for hemodialysis?

AAMI RD5
AAMI TIR34
AAMI RD52 (Correct answer)
AAMI RD47

Correct answer: AAMI RD52

ANSI/AAMI RD52 is the standard that specifically addresses the reuse of hemodialyzers, outlining requirements for cleaning, testing, germicide use, documentation, and quality assurance in dialyzer reprocessing programs.

Question 108: A patient asks why they cannot use lotion on their access site on the day of treatment. What is the best explanation?

It will cause the access to clot
It can cause a severe allergic reaction with the dialyzer
Lotions can interfere with proper site cleaning and increase infection risk (Correct answer)
It can make the skin too slippery for the needles

Correct answer: Lotions can interfere with proper site cleaning and increase infection risk

Proper disinfection of the cannulation sites is critical to prevent access-related infections. Lotions and creams can create a barrier that prevents the antiseptic from effectively killing bacteria on the skin, and they can also be introduced into the bloodstream during cannulation.

Question 109: A patient on a reuse program develops fever and rigors during dialysis using a reprocessed dialyzer. What is the most likely cause related to the reprocessing process?

Pyrogenic reaction from bacterial endotoxins in the dialyzer (Correct answer)
Inadequate ultrafiltration from reduced TCV
Hemolysis from excess anticoagulation
Air embolism from improper priming of the dialyzer

Correct answer: Pyrogenic reaction from bacterial endotoxins in the dialyzer

Fever and rigors during dialysis with a reprocessed dialyzer suggest a pyrogenic reaction caused by bacterial endotoxins (lipopolysaccharides) contaminating the dialyzer. This can occur if reprocessing water quality was substandard or if biofilm developed in the dialyzer.

Question 110: What is the primary purpose of the Total Cell Volume (TCV) or Fiber Bundle Volume (FBV) test during dialyzer reprocessing?

To verify the patient's name is correctly matched to the dialyzer
To check for residual sterilant in the dialyzer
To ensure the dialyzer can still effectively clear waste products (Correct answer)
To confirm the integrity of the dialyzer membrane and check for leaks

Correct answer: To ensure the dialyzer can still effectively clear waste products

The TCV test measures the internal volume of the hollow fibers. A significant drop in TCV, typically below 80% of the original volume, indicates that clotting or protein deposits have blocked too many fibers, reducing the dialyzer's surface area and its ability to provide adequate clearance of waste products.

Question 111: What does a Kt/V value of 1.2 indicate about a hemodialysis patient's treatment adequacy?

The patient is receiving the minimum adequate dose of dialysis per current guidelines (Correct answer)
The Kt/V value is unrelated to treatment adequacy in hemodialysis
The patient is receiving inadequate dialysis and the treatment time or blood flow rate should be increased
The patient is being over-dialyzed and the treatment time should be reduced

Correct answer: The patient is receiving the minimum adequate dose of dialysis per current guidelines

Kt/V of 1.2 meets the minimum KDOQI recommended target for thrice-weekly hemodialysis (minimum 1.2, target ≥1.4). It indicates the patient is receiving an adequate dose of dialysis, though higher values provide additional benefit.

Question 112: The mass transfer coefficient of a dialyzer refers to ____________.

the size of the solutes that pass through the dialyzer membrane
how well solutes pass through the dialyzer membrane (Correct answer)
the volume of water that will be removed during dialysis
the volume of blood that passes through the dialyzer

Correct answer: how well solutes pass through the dialyzer membrane

The mass transfer coefficient (KoA) of a dialyzer is a critical measure of its efficiency in removing solutes from the blood. It quantifies how readily solutes, or waste products, can cross the semipermeable membrane from the patient's blood into the dialysate fluid. A higher KoA value indicates a more efficient dialyzer for clearing waste products.

Question 113: Which of the following is an important step before starting dialysis?

All of the above (Correct answer)
Check for leaks
Ensure air detectors are functioning
Verify patient weight

Correct answer: All of the above

Before starting dialysis, it is crucial to perform a comprehensive safety check to ensure patient safety and effective treatment. Verifying the patient's weight is essential for accurate ultrafiltration goals, checking for leaks in the circuit prevents blood loss and contamination, and ensuring air detectors are functioning properly prevents life-threatening air embolisms. All these steps are vital for a safe and successful dialysis session.

Question 114: What are the signs and symptoms of arteriovenous fistula infiltration (extravasation) during hemodialysis?

Decreased venous return pressure and increased blood flow rate through the circuit
Decrease in temperature at the fistula site without swelling or pain
Increased thrill and bruit indicating improved flow to the fistula
Swelling, pain, and hardness at or near the needle site, often accompanied by a pressure alarm change (Correct answer)

Correct answer: Swelling, pain, and hardness at or near the needle site, often accompanied by a pressure alarm change

Infiltration occurs when the needle is displaced outside the vessel lumen and blood or saline infiltrates the surrounding tissue. Signs include sudden swelling (hematoma), pain and tenderness at the needle site, firmness of the tissue, and often a change in arterial or venous pressure alarms.

Question 115: What is the primary function of a dialysis machine?

To monitor vital signs
To filter blood and remove waste (Correct answer)
To assist with breathing
To administer medications

Correct answer: To filter blood and remove waste

The primary function of a dialysis machine is to act as an artificial kidney for patients with end-stage renal disease. It filters the patient's blood to remove excess fluid, waste products (like urea, creatinine, and potassium), and toxins that their own kidneys can no longer eliminate. This process helps to maintain the body's chemical balance and prevent life-threatening complications.

Question 116: During a water quality check, the RO product water conductivity reading is 45 μS/cm, significantly higher than the baseline of 8 μS/cm. What does this most likely indicate?

Normal seasonal variation in source water mineral content
The RO membrane is failing or bypassed, allowing solutes to pass through into the product water (Correct answer)
The carbon tank is exhausted and releasing chloramine into the RO feed
The softener has been regenerated and is releasing excess sodium temporarily

Correct answer: The RO membrane is failing or bypassed, allowing solutes to pass through into the product water

A sudden increase in RO product water conductivity from 8 to 45 μS/cm (nearly 6-fold increase) indicates that the RO membrane is no longer effectively rejecting dissolved solutes. This is a significant quality failure requiring immediate investigation and potentially halting patient treatments until resolved.

Question 117: What is the purpose of the ESRD Quality Incentive Program (QIP)?

To provide financial bonuses to patients who comply with their dialysis schedule
To establish minimum staffing ratios for hemodialysis units
To fund capital improvements in dialysis facilities in rural areas
To reduce Medicare payments to dialysis facilities with poor performance on quality measures (Correct answer)

Correct answer: To reduce Medicare payments to dialysis facilities with poor performance on quality measures

The ESRD Quality Incentive Program (QIP) is a CMS value-based purchasing program that penalizes dialysis facilities with substandard performance on clinical and operational quality measures by reducing their total performance score-based Medicare payments by up to 2%.

Question 118: According to the 'Rule of 6s,' which set of criteria indicates that an AV fistula is mature and ready for cannulation?

Flow >800 mL/min, diameter ≥8 mm, depth ≤4 mm, maturation ≥8 weeks
Flow >400 mL/min, diameter ≥4 mm, depth ≤8 mm, maturation ≥4 weeks
Flow >600 mL/min, diameter ≥6 mm, depth ≤6 mm, maturation ≥6 weeks (Correct answer)
Flow >500 mL/min, diameter ≥5 mm, depth ≤5 mm, maturation ≥5 weeks

Correct answer: Flow >600 mL/min, diameter ≥6 mm, depth ≤6 mm, maturation ≥6 weeks

The Rule of 6s states a fistula is mature when it has blood flow exceeding 600 mL/min, a vessel diameter of at least 6 mm, is no more than 6 mm below the skin surface, and has had at least 6 weeks to mature. These thresholds help ensure reliable cannulation and adequate dialysis delivery.

Question 119: A dialysis patient mentions feeling depressed and that life is not worth living. What is the appropriate response?

Document the comment and continue the treatment without immediate action
Tell the patient depression is common and they should speak with their doctor at their next appointment
Reassure the patient that many people feel this way and change the subject
Take the comment seriously, express concern, notify the social worker and charge nurse, and ensure the patient is not left alone (Correct answer)

Correct answer: Take the comment seriously, express concern, notify the social worker and charge nurse, and ensure the patient is not left alone

Any statement suggesting suicidal ideation or hopelessness requires immediate safety assessment, notification of the social worker and charge nurse, and ensuring the patient is safe.

Question 120: Who developed the first permanent blood access, the "Shunt"?

Scribner and Quinton (Correct answer)
Turner
Brescia and Cimino
Kolff

Correct answer: Scribner and Quinton

Belding Scribner and Wayne Quinton are recognized for developing the first permanent arteriovenous (AV) shunt in 1960. This innovation provided reliable, repeated access to a patient's bloodstream for long-term hemodialysis. Their work made chronic dialysis a practical treatment, significantly improving the prognosis for patients with end-stage renal disease.

Question 121: What is the target range for serum intact parathyroid hormone (iPTH) in patients on maintenance hemodialysis?

1000–1500 pg/mL
600–1000 pg/mL
150–600 pg/mL (2–9 times the upper limit of normal) (Correct answer)
10–65 pg/mL (normal range for healthy adults)

Correct answer: 150–600 pg/mL (2–9 times the upper limit of normal)

KDIGO guidelines recommend targeting iPTH levels 2–9 times the upper limit of normal for the assay used, which for most laboratories corresponds to approximately 150–600 pg/mL. This range balances suppression of excessive bone remodeling against the risks of adynamic bone disease from over-suppression.

Question 122: When creating a buttonhole tract, how many consecutive cannulations are usually required before the tract is adequately formed?

4 to 5
10 to 12
5 to 8
8 to 10 (Correct answer)

Correct answer: 8 to 10

When establishing a buttonhole cannulation tract, it typically requires 8 to 10 consecutive cannulations using the exact same angle and depth. This consistent technique helps to create a stable, well-formed tunnel or tract, which makes future cannulations easier, less painful, and potentially reduces the risk of complications like infiltrations or infections.

Question 123: Which chemical is most commonly used as a germicide during manual dialyzer reprocessing?

Glutaraldehyde
Peracetic acid (Correct answer)
Formaldehyde
Bleach (sodium hypochlorite)

Correct answer: Peracetic acid

Peracetic acid (PAA) is the most commonly used germicide for dialyzer reprocessing because it is effective, relatively safe, and dissipates rapidly. Formaldehyde was historically used but has largely been replaced due to health hazards.

Question 124: Which of the following is the earliest and most reliable sign of needle infiltration during a hemodialysis treatment?

An increase in the arterial pressure alarm above baseline
Blood appearing in the arterial drip chamber
A sudden drop in the venous pressure alarm
Localized swelling and pain at the needle insertion site (Correct answer)

Correct answer: Localized swelling and pain at the needle insertion site

Infiltration occurs when the needle tip exits the vessel lumen into surrounding tissue. The immediate result is extravasation of blood or dialysate, causing localized swelling, firmness, and pain at the site. Pressure alarms may change secondarily but are not as specific or early an indicator.

Question 125: What is the role of the reverse osmosis (RO) unit in the dialysis water treatment system?

To neutralize chloramines that were not removed by the activated carbon tanks
To add necessary minerals and electrolytes to the purified water for dialysate preparation
To remove the majority of dissolved solutes, bacteria, and endotoxins from the pretreated water (Correct answer)
To sterilize the water by ultraviolet irradiation before distribution to dialysis machines

Correct answer: To remove the majority of dissolved solutes, bacteria, and endotoxins from the pretreated water

The reverse osmosis unit is the primary purification step, removing 90–99% of dissolved solutes (including toxic metals, bacteria, viruses, and endotoxins) through membrane filtration under high pressure. It produces the ultrapure water required for dialysate preparation.

Question 126: What is the significance of the transmembrane pressure (TMP) reading on a hemodialysis machine?

It monitors the speed of the dialysate pump
It indicates the pressure driving fluid across the dialyzer membrane for ultrafiltration (Correct answer)
It measures the patient's blood pressure during treatment
It measures resistance in the arterial blood line

Correct answer: It indicates the pressure driving fluid across the dialyzer membrane for ultrafiltration

TMP is the pressure difference across the dialyzer membrane that drives ultrafiltration (fluid removal) from the blood side to the dialysate side.

Question 127: During pre-treatment assessment, a patient reports taking a new herbal supplement for kidney health. What is the most appropriate response?

Tell the patient herbal supplements are safe and not to worry
Document the supplement, inform the charge nurse, and ask the patient not to take it until cleared by the nephrologist (Correct answer)
Ignore the information as it is not medically relevant
Advise the patient that all natural supplements are safe for dialysis patients

Correct answer: Document the supplement, inform the charge nurse, and ask the patient not to take it until cleared by the nephrologist

Many herbal supplements contain potassium, phosphorus, or nephrotoxic compounds and can interact with medications; all supplements must be reviewed by the nephrologist.

Question 128: When inserting the arterial needle into an AV fistula for hemodialysis, in which direction should the needle bevel face and why?

Bevel toward the arterial anastomosis to align with the direction of blood flow
Bevel up (facing away from the vessel wall) to facilitate entry into the lumen and optimal blood inflow (Correct answer)
Needle direction does not affect blood flow and is based on technician preference
Bevel down (facing the vessel wall) to prevent the bevel from sucking against the vessel wall

Correct answer: Bevel up (facing away from the vessel wall) to facilitate entry into the lumen and optimal blood inflow

The needle bevel should face upward (away from the vessel wall) during insertion to facilitate smooth entry into the vessel lumen, reduce vessel wall trauma during insertion, and prevent the needle bevel from creating a flap valve against the vessel wall that would obstruct blood inflow.

Question 129: A patient wants to travel internationally. What education should the dialysis technician provide?

Carry extra dialysis supplies to do home dialysis anywhere
International travel is not possible for dialysis patients
Arrange dialysis treatments at a certified center at the destination before traveling (Correct answer)
Dialysis can be safely skipped for up to one week while traveling

Correct answer: Arrange dialysis treatments at a certified center at the destination before traveling

Patients must arrange dialysis treatments at a licensed center at their destination before traveling, as treatments cannot be safely skipped.

Question 130: How many consecutive cannulations are typically necessary to form a buttonhole tract before it is sufficiently formed?

4 to 5.
10 to 12.
8 to 10. (Correct answer)
5 to 8.

Correct answer: 8 to 10.

Usually 8 to 10 consecutive cannulations are needed to establish a buttonhole tract before it is complete. It is crucial that the same individual do the cannulations throughout this development phase because doing so increases the likelihood that the same angle will be applied each time. Grafts cannot be operated on using the buttonhole technique because they lack the muscle fibers that constrict around the tract once the needle is removed.

Question 131: During hemodialysis, a patient develops sudden severe chest pain and shortness of breath. Which emergency condition should the technician consider first?

Hypoglycemia
Dialyzer reaction
Air embolism
Pulmonary embolism or cardiac event (Correct answer)

Correct answer: Pulmonary embolism or cardiac event

Sudden severe chest pain with dyspnea during dialysis is a red-flag presentation for a pulmonary embolism or acute cardiac event (myocardial infarction, unstable angina). These are life-threatening emergencies requiring immediate cessation of dialysis, physician notification, and 911 activation.

Question 132: What is the purpose of a disaster plan specific to a dialysis facility?

To provide instructions for disposing of dialysis equipment during natural disasters
To outline payroll procedures during emergencies
To ensure patient treatments can continue or be safely transferred during facility-wide emergencies (Correct answer)
To document the facility's liability in case of patient harm during an emergency

Correct answer: To ensure patient treatments can continue or be safely transferred during facility-wide emergencies

A dialysis facility disaster plan ensures that life-sustaining treatments can continue or be safely transitioned during emergencies such as power outages, natural disasters, or facility evacuations. ESRD patients cannot safely miss multiple dialysis treatments without risk of death.

Question 133: Diffusion is a process that involves _____________.

movement of solutes through a semipermeable membrane from an area of lower concentration to higher
movement of fluid through a semipermeable membrane from an area of lower concentration to higher
movement of fluid through a semipermeable membrane from an area of higher concentration to lower
movement of solutes through a semipermeable membrane from an area of higher concentration to lower (Correct answer)

Correct answer: movement of solutes through a semipermeable membrane from an area of higher concentration to lower

Diffusion is a fundamental principle in hemodialysis, where waste products (solutes) move from the patient's blood, which has a higher concentration of these wastes, across a semipermeable membrane into the dialysate, which has a lower concentration. This passive movement continues until equilibrium is reached, effectively removing toxins from the blood. This process is driven by the concentration gradient, without requiring energy.

Question 134: Patients receiving hemodialysis are at risk for amyloidosis. Which of the following symptoms may indicate amyloidosis?

Hypertension
Joint pain (Correct answer)
Bleeding
Anemia

Correct answer: Joint pain

Dialysis-related amyloidosis (DRA) is a complication that can occur in long-term hemodialysis patients, caused by the accumulation of beta-2 microglobulin. A common symptom of DRA is joint pain, particularly in the shoulders, wrists, and hands, often accompanied by carpal tunnel syndrome. Recognizing this symptom is important for early diagnosis and management.

Question 135: In a non-urgent clinical situation, how long should a technician typically wait before cannulating a newly placed synthetic AV graft?

2–4 weeks (Correct answer)
3–5 days
3–6 months
24–48 hours

Correct answer: 2–4 weeks

Standard synthetic AV grafts require approximately 2–4 weeks of healing time to allow the graft material to incorporate into surrounding tissue and edema to resolve, reducing the risk of infiltration and hematoma on first cannulation. Early cannulation grafts are a separate product designed for use within 24–72 hours.

Question 136: What should you do if the dialysis machine alarms due to a low blood flow?

Check for clots or kinks (Correct answer)
Stop dialysis immediately
Increase the blood flow rate
Continue dialysis

Correct answer: Check for clots or kinks

A low blood flow alarm during dialysis typically indicates an obstruction or issue within the extracorporeal circuit or the patient's vascular access. Common causes include kinks in the bloodlines, clotted access, or vasospasm. The appropriate response is to investigate and resolve these mechanical issues to restore proper blood flow and ensure effective dialysis treatment.

Question 137: According to AAMI standards, a reprocessed dialyzer must be discarded if its fiber bundle volume (FBV) drops below what percentage of its original measured volume?

90%
80% (Correct answer)
75%
70%

Correct answer: 80%

The Association for the Advancement of Medical Instrumentation (AAMI) sets the standard that a reprocessed dialyzer must retain at least 80% of its original TCV/FBV. If the volume drops below this threshold, the dialyzer has lost too much surface area to provide an adequate treatment and must be discarded.

Question 138: Before a reprocessed dialyzer is used for a patient's treatment, what is the most critical final check that must be performed at the patient's station?

Checking the external casing for cracks
Verifying the TCV is above 90%
Testing for residual sterilant (Correct answer)
Confirming the original prime volume

Correct answer: Testing for residual sterilant

It is absolutely critical to ensure that no residual sterilant remains in the dialyzer before it is connected to the patient. Exposure to even small amounts of chemicals like peracetic acid can cause serious adverse reactions, including hemolysis and anaphylaxis. This is tested for right before use.

Question 139: What information must be documented on the label of a reprocessed dialyzer?

Patient name, dialyzer model number, and germicide brand name
Patient name or ID, reuse count, and date of last reprocessing (Correct answer)
Physician name, germicide concentration, and date of first use
Nurse's initials, reuse count, and TCV percentage

Correct answer: Patient name or ID, reuse count, and date of last reprocessing

Reprocessed dialyzer labels must include the patient identifier, the reuse count, and the date of the most recent reprocessing. This information is essential for tracking and verifying the dialyzer is correctly matched to the patient and within policy limits.

Question 140: The aluminum level in dialysis water should be ___________.

≤ 0.03 mg/L
≤ 0.01 mg/L (Correct answer)
≤ 0.02 mg/L
≤ 0.04 mg/L

Correct answer: ≤ 0.01 mg/L

The aluminum level in dialysis water must be strictly controlled to prevent aluminum toxicity in patients, which can lead to bone disease, anemia, and neurological problems. According to AAMI (Association for the Advancement of Medical Instrumentation) standards, the maximum allowable aluminum concentration in dialysis water is ≤ 0.01 mg/L. This stringent limit is vital for patient safety and preventing long-term complications.

Question 141: What lab values are monitored for assessing bone disease?

Calcium, phosphorus and albumin
Calcium, phosphorus and magnesium
Calcium, phosphorus and PTH (Correct answer)
Calcium, phosphorus and potassium

Correct answer: Calcium, phosphorus and PTH

Chronic kidney disease often leads to mineral and bone disorders (CKD-MBD) due to imbalances in mineral metabolism. To assess and manage bone disease, healthcare providers closely monitor serum levels of calcium, phosphorus, and parathyroid hormone (PTH). Imbalances in these three parameters are key indicators of bone health issues in dialysis patients, guiding appropriate treatment decisions.

Question 142: If an air embolism is suspected, in addition to stopping the blood pump, what is the correct position to place the patient in?

High Fowler's position
Trendelenburg position on the left side (Correct answer)
Prone position
Supine with head elevated

Correct answer: Trendelenburg position on the left side

If an air embolism is suspected, the patient should be placed in the Trendelenburg position on their left side. This position helps to trap the air in the right ventricle of the heart, preventing it from traveling to the lungs or brain where it could cause a fatal blockage.

Question 143: A patient is very anxious during an initial hemodialysis treatment and requires extra attention. When the treatment is completed, the patient offers a $20 tip. The technician should:

Suggest the patient donate the tip to a charity.
Politely decline the tip. (Correct answer)
Inform the patient that accepting tips is against facility policy.
Accept the tip gratefully.

Correct answer: Politely decline the tip.

Healthcare professionals, including hemodialysis technicians, are bound by ethical codes that prohibit accepting gifts or tips from patients. This practice helps maintain professional boundaries, prevents conflicts of interest, and ensures that care is provided based solely on medical need, not on potential personal gain. Politely declining the tip upholds professional integrity and avoids any perception of impropriety.

Question 144: What is the correct method to assess an AV fistula?

Flush with saline
Check for pain response
Measure blood flow with a cuff
Palpate for thrill and listen for bruit (Correct answer)

Correct answer: Palpate for thrill and listen for bruit

Assessing an AV fistula involves both palpation and auscultation to confirm its patency and function. A 'thrill' is a palpable vibration felt over the fistula, indicating blood flow, and a 'bruit' is a whooshing sound heard with a stethoscope, also confirming adequate blood flow. The presence of a strong thrill and bruit indicates a healthy, functioning fistula.

Question 145: The required contact time for dialyzer reprocessing in a dialysis facility using peracetic acid as the germicide is ____________.

10 hours.
24 hours.
20 hours.
11 hours. (Correct answer)

Correct answer: 11 hours.

The required contact time for dialyzer reprocessing at a dialysis facility using peracetic acid as the germicide is 11 hours. There are four primary forms of germicides, but only one can be used at a time: heat disinfection (with citric acid) (20 hours contact time), glutaraldehyde (10 hours contact time), formaldehyde (24 hours contact time), and peracetic acid (most frequently used). Although peracetic acid is more expensive than the majority of other germicides, it is less dangerous for users than formaldehyde or glutaraldehyde.

Question 146: Which of the following is an indication that a patient may be losing fat and/or muscle mass even though he or she reaches the target dry weight after treatment?

Patient complains of poor appetite.
Patient has ankle swelling that decreases after treatment.
Patient becomes short of breath if lying flat after treatment. (Correct answer)
Patient complains of headache after treatment.

Correct answer: Patient becomes short of breath if lying flat after treatment.

If a patient becomes short of breath when lying flat (orthopnea) even after reaching their target dry weight, it can indicate that their 'dry weight' is actually too low. This symptom suggests that the patient may be losing lean body mass (muscle and fat) instead of just excess fluid, leading to inadequate fluid volume in the vascular space and potential cardiac strain. It's a critical sign that the dry weight assessment needs re-evaluation.

Question 147: During hemodialysis, a patient develops sudden severe chest pain, dyspnea, and becomes cyanotic. The blood in the venous line appears pink/clear instead of dark red. What emergency is occurring?

Severe hypotension causing tissue hypoperfusion
Pulmonary embolism from DVT
Air embolism from a disconnected blood line
Hemolysis (red cell destruction from mechanical or chemical causes) (Correct answer)

Correct answer: Hemolysis (red cell destruction from mechanical or chemical causes)

Pink/clear blood (hemolyzed blood) indicates massive hemolysis, a life-threatening dialysis emergency where red blood cells are being destroyed.

Question 148: According to AAMI standards, what is the maximum allowable endotoxin level in water used for standard hemodialysis?

0.25 EU/mL
2 EU/mL (Correct answer)
0.03 EU/mL
10 EU/mL

Correct answer: 2 EU/mL

AAMI standards set the maximum endotoxin level at 2 EU/mL for standard dialysis water, with an action level of 1 EU/mL. Exceeding these limits puts patients at risk for pyrogenic (fever-producing) reactions during treatment.

Question 149: A dialysis patient develops aluminum toxicity. Which water treatment failure is the most likely cause?

Failure of the water softener to remove calcium
Failure of the ultraviolet light sterilization unit
Chloramine breakthrough from an exhausted carbon filter
Inadequate removal of aluminum from the source water by the RO system (Correct answer)

Correct answer: Inadequate removal of aluminum from the source water by the RO system

Aluminum toxicity in dialysis patients is primarily caused by inadequate removal of aluminum from source water, which then enters the patient's bloodstream via the dialysate. The RO system must effectively remove aluminum; failure of the RO or elevated source water aluminum can cause toxic accumulation.

Question 150: When using bleach (sodium hypochlorite) as a cleaning agent in dialyzer reprocessing, what is the primary hazard to the patient if residual bleach is not adequately removed?

Metabolic alkalosis
Hypoglycemia
Intravascular hemolysis (Correct answer)
Severe hypertension

Correct answer: Intravascular hemolysis

Residual sodium hypochlorite (bleach) in the blood compartment can cause intravascular hemolysis, destroying red blood cells and leading to hemolytic anemia, hemoglobinemia, and potentially renal tubular damage in any remaining kidney function. This is a serious and potentially fatal complication.

Certified Clinical Hemodialysis Technician (CCHT)

The CCHT certification validates the knowledge and skills of hemodialysis technicians, ensuring they can safely and effectively provide care to patients undergoing dialysis.

150

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180 min

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