Certified Clinical Hemodialysis Technician (CCHT) — Questions and Answers

Question 1: How often should dialysis machines be disinfected?

Only when visibly soiled
Once a month
After each use (Correct answer)
Once a week

Correct answer: After each use

Dialysis machines must be disinfected after each patient use to prevent the transmission of infections. This rigorous cleaning protocol ensures that any potential pathogens from one patient are eliminated before the machine is used for the next, thereby maintaining a sterile and safe environment for all individuals undergoing treatment.

Question 2: How long can a reprocessed dialyzer typically be stored before it must be used or discarded?

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

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

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

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 4: 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?

Hypoglycemia
Intravascular hemolysis (Correct answer)
Severe hypertension
Metabolic alkalosis

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.

Question 5: 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 6: What is the buttonhole (constant site) cannulation technique, and what is its primary risk compared to the rope ladder method?

A technique using a button-shaped needle for reduced pain; risk is higher infiltration rate
A technique for very small fistulas using pediatric needles; risk is lower blood flow
Inserting needles into the same track repeatedly to create a permanent blunt-needle cannulation site; risk is higher infection rate (Correct answer)
A technique only for experienced nurses; risk is limited availability

Correct answer: Inserting needles into the same track repeatedly to create a permanent blunt-needle cannulation site; risk is higher infection rate

Buttonhole cannulation creates a permanent subcutaneous track for blunt needle insertion, reducing cannulation pain, but carries a significantly higher infection risk than rope ladder.

Question 7: The Centers for Medicare & Medicaid Services (CMS) plays what critical role in dialysis facilities?

It sets quality and safety standards that facilities must meet to receive reimbursement. (Correct answer)
It provides continuing education credits for technicians.
It manufactures dialysis machines and supplies.
It directly hires and trains all dialysis nurses and technicians.

Correct answer: It sets quality and safety standards that facilities must meet to receive reimbursement.

CMS is the federal agency that administers Medicare. For a dialysis facility to be paid for treating patients, it must be certified by CMS, which involves meeting extensive regulations regarding patient care, safety, and outcomes.

Question 8: A patient on dialysis has a serum albumin of 2.8 g/dL. What does this value indicate and why is it clinically significant?

Normal albumin; no intervention needed
Excessive protein intake requiring dietary restriction
Malnutrition with poor prognosis; requires nutritional intervention and dietary consultation (Correct answer)
Fluid overload diluting albumin levels only

Correct answer: Malnutrition with poor prognosis; requires nutritional intervention and dietary consultation

Serum albumin below 3.5 g/dL indicates malnutrition or inflammatory state, and levels below 3.0 g/dL are associated with significantly increased morbidity and mortality in dialysis patients.

Question 9: Which chemical is most commonly used as a germicide during manual dialyzer reprocessing?

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

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 10: What is the role of the ultrafiltration pump in dialysis?

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

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 11: With uremia, as waste products build up in the blood, this can result in _____________.

ammonia breath (Correct answer)
ringing in the ears
rash
abdominal pain

Correct answer: ammonia breath

Uremia is a condition where waste products, particularly urea, build up in the blood due to kidney failure. One characteristic symptom of severe uremia is ammonia breath, also known as uremic fetor. This distinctive odor results from the breakdown of urea into ammonia in the saliva, indicating a significant accumulation of toxins in the body.

Question 12: Which of the following non-prescription remedies might help treat symptoms if a patient complains of chronic itching?

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

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 13: What should be checked before starting dialysis treatment?

Verify the patient's insurance details
Check if the patient has eaten recently
Review the patient's medication history
Ensure stability and equipment readiness (Correct answer)

Correct answer: Ensure stability and equipment readiness

Before initiating dialysis treatment, it is paramount to ensure both patient stability and equipment readiness. This involves verifying the patient's vital signs and overall condition are suitable for treatment, and meticulously checking that the dialysis machine, lines, and dialyzer are correctly assembled, primed, and functioning properly. This comprehensive check minimizes risks and ensures a safe and effective treatment session.

Question 14: 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)
Only when the reverse osmosis membrane is being serviced
Weekly, or after any water utility maintenance in the area

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

Glutaraldehyde
Sodium Hypochlorite
Formaldehyde
Peracetic Acid (Correct answer)

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

Activated carbon adsorption of heavy metals and ions
Forcing water through a semi-permeable membrane under pressure, rejecting 90–99% of dissolved solutes (Correct answer)
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 17: 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%
75%
70%
80% (Correct answer)

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

70% of the original TCV
95% of the original TCV
80% of the original TCV (Correct answer)
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 19: During needle removal after hemodialysis, what is the correct method to achieve hemostasis at the needle sites?

Apply a tourniquet above the access site
Apply firm digital pressure with gauze for 5 to 10 minutes without releasing (Correct answer)
Apply ice immediately to constrict blood vessels
Use sutures to close the needle site

Correct answer: Apply firm digital pressure with gauze for 5 to 10 minutes without releasing

Firm, continuous digital pressure on the needle sites for 5 to 10 minutes (or until bleeding stops) achieves hemostasis without disrupting clot formation.

Question 20: As part of anemia management for patients receiving hemodialysis, the technician should ___________.

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

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 21: The complication in which blood has a "cherry pop" appearance is:

blood leak
air embolism
hemolysis (Correct answer)
None of the above

Correct answer: hemolysis

Hemolysis is the rupture or destruction of red blood cells, which releases hemoglobin into the plasma. When severe, this can give the blood a characteristic 'cherry red' or 'cherry pop' appearance due to the free hemoglobin. Hemolysis during dialysis is a serious complication that can be caused by various factors, including incorrect dialysate osmolarity, overheating of blood, or exposure to certain chemicals.

Question 22: A hemodialysis patient consistently gains 4–5 kg between treatments (interdialytic weight gain, IDWG). Which of the following dietary changes would most directly address this problem?

Restrict phosphorus intake to improve vascular compliance
Increase protein intake to improve albumin and oncotic pressure
Reduce dietary sodium intake to decrease thirst and fluid consumption (Correct answer)
Increase potassium intake to balance the high fluid load

Correct answer: Reduce dietary sodium intake to decrease thirst and fluid consumption

High dietary sodium intake causes thirst, which drives fluid consumption. Reducing sodium intake (target <2000 mg/day) directly reduces thirst and thereby reduces the amount of fluid consumed between dialysis sessions, reducing IDWG.

Question 23: Which type of hemodialysis vascular access carries the highest risk of bloodstream infection?

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

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 24: What should be assessed when inspecting the vascular access site?

Assess the patient's overall condition
Monitor the patient's pulse
Check for swelling and redness
Check for infection, patency, and proper blood flow (Correct answer)

Correct answer: Check for infection, patency, and proper blood flow

The vascular access site is the lifeline for hemodialysis, so its integrity is paramount. Assessment involves visually checking for signs of infection (redness, swelling, pus) and palpating for a thrill and auscultating for a bruit to confirm patency and adequate blood flow. Ensuring the access is healthy and functioning correctly is crucial for safe and effective dialysis treatment.

Question 25: What is the purpose of testing dialysis water for endotoxins?

To confirm the water is free of aluminum and heavy metals
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
To measure the total dissolved solids that might interfere with dialysate mixing

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 26: A patient experiences a seizure during treatment. After calling for help and ensuring the patient is safe from injury, what is the next immediate step related to the treatment?

Stop ultrafiltration and reduce the blood flow rate (Correct answer)
Place a tongue depressor in the patient's mouth
Disconnect the patient from the machine immediately
Increase the blood flow rate to improve brain perfusion

Correct answer: Stop ultrafiltration and reduce the blood flow rate

The immediate action related to the dialysis treatment is to reduce physiological stress on the patient. Stopping ultrafiltration and lowering the blood flow rate can help stabilize the patient, as seizures can sometimes be triggered by hypotension or disequilibrium syndrome.

Question 27: What is the purpose of the ESRD Quality Incentive Program (QIP)?

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

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 28: What is the correct angle at which to cannulate a fistula?

It doesn't matter
10-15 degrees
25-35 degrees (Correct answer)
35-45 degrees

Correct answer: 25-35 degrees

Cannulating a fistula at an angle of 25-35 degrees is recommended to ensure proper needle placement within the vessel lumen without puncturing the back wall. This angle allows for smooth entry and minimizes trauma to the vessel, which is crucial for preserving the long-term patency and function of the fistula. Incorrect angles can lead to complications such as hematoma, infiltration, or damage to the access.

Question 29: According to AAMI RD52, how often should bacterial cultures be sampled?

Monthly (Correct answer)
Weekly
Quarterly
Annually

Correct answer: Monthly

AAMI RD52 guidelines mandate that bacterial cultures for dialysate be sampled monthly. This regular monitoring ensures ongoing compliance with safety standards and helps detect any increases in bacterial levels promptly. Timely detection allows for intervention to prevent patient exposure to contaminated dialysate and potential infections.

Question 30: What is the role of the CCHT in preventing wrong patient, wrong treatment errors in the dialysis unit?

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
Only the charge nurse is responsible for patient identification
Patient identification is only checked at the first treatment

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

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

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 32: 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 33: What should you do if the dialysis machine alarms due to a low blood flow?

Stop dialysis immediately
Increase the blood flow rate
Check for clots or kinks (Correct answer)
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 34: When teaching a patient about a renal diet, which three minerals are typically the most important to restrict?

Magnesium, chloride, and iron
Iron, calcium, and zinc
Sodium, potassium, and phosphorus (Correct answer)
Calcium, potassium, and vitamin D

Correct answer: Sodium, potassium, and phosphorus

A renal diet is designed to limit the buildup of waste products and electrolytes that the kidneys can no longer filter effectively. Sodium can cause fluid retention and high blood pressure, high potassium can lead to dangerous heart rhythms, and high phosphorus can cause bone disease.

Question 35: What is the recommended angle of needle insertion when cannulating a mature arteriovenous fistula?

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

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

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

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 37: What is an important consideration when caring for a patient who is visually impaired during hemodialysis?

Assign them to a chair in the back away from other patients
Family members must be present for all treatments
Orient the patient to equipment sounds and alarms, explain all procedures verbally, and ensure the environment is safe and consistent (Correct answer)
They do not need any special accommodations during treatment

Correct answer: Orient the patient to equipment sounds and alarms, explain all procedures verbally, and ensure the environment is safe and consistent

Visually impaired patients need verbal orientation, explanations of all sounds and procedures, and a consistently arranged environment to support safety and reduce anxiety.

Question 38: A dialysis patient asks to see their own medical records. Under HIPAA, how should the facility respond?

Deny the request as medical records contain technical information patients cannot understand
Provide verbal summary only; written records cannot be given directly to patients
Refer the patient to their nephrologist to obtain records through the physician's office
Provide access within 30 days (or 60 days with one 30-day extension) at a reasonable cost (Correct answer)

Correct answer: Provide access within 30 days (or 60 days with one 30-day extension) at a reasonable cost

Under the HIPAA Privacy Rule, patients have the right to access their own protected health information (PHI), including medical records. Facilities must respond within 30 days (extendable to 60 days with notice) and may charge a reasonable cost-based fee for copying records.

Question 39: 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?

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

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

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

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 41: Normal saline has a sodium chloride concentration of ___________.

0.90% (Correct answer)
0.70%
0.80%
1.00%

Correct answer: 0.90%

Normal saline, also known as 0.9% sodium chloride solution, is an isotonic solution commonly used in medical settings, including dialysis. Its concentration of 0.90% sodium chloride is approximately equivalent to the concentration of solutes in human blood plasma. This makes it suitable for intravenous administration without causing significant fluid shifts in cells.

Question 42: Which members of the dialysis center team are responsible for carrying out the quality assessment and performance improvement program at a dialysis center?

All staff (Correct answer)
Technicians
Nurses
Nephrologist

Correct answer: All staff

A successful Quality Assessment and Performance Improvement (QAPI) program requires the active participation and commitment of all staff members within a dialysis center. From technicians and nurses to social workers and nephrologists, everyone plays a role in identifying areas for improvement, implementing changes, and monitoring outcomes. This collective effort ensures a comprehensive approach to enhancing patient care and safety.

Question 43: 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)
2.0 ppm.
0.4 ppm.
4.0 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 44: What is the appropriate gauge needle to use for hemodialysis cannulation in standard adult patients?

15 to 17 gauge needles are standard for most adult hemodialysis patients (Correct answer)
20 to 22 gauge needles to minimize vessel trauma
18-gauge (largest diameter)
Gauge does not matter as long as blood flow is adequate

Correct answer: 15 to 17 gauge needles are standard for most adult hemodialysis patients

15 to 17 gauge needles are the standard size for hemodialysis, large enough to achieve prescribed blood flow rates (300 to 500 mL/min) without excessive negative pressure.

Question 45: The movement of water from an area of low solute concentration to an area of high solute concentration is called:

diffusion
dialysis
ultrafiltration
osmosis (Correct answer)

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 46: The reason potassium dialyzes and RBCs do not is:

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

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

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

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 48: What is the purpose of administering vitamin D analogs (e.g., calcitriol) to hemodialysis patients?

Suppress secondary hyperparathyroidism and manage bone disease (Correct answer)
Lower blood pressure
Reduce fluid overload
Treat metabolic acidosis

Correct answer: Suppress secondary hyperparathyroidism and manage bone disease

Active vitamin D analogs suppress parathyroid hormone (PTH) secretion to manage secondary hyperparathyroidism and renal osteodystrophy in dialysis patients.

Question 49: Acceptable limits for total chlorines in water for hemodialysis are?

less than 0 .1mg/L (ppm) (Correct answer)
0.5 mg/L to 1 mg/L(ppm)
greater than 6.0 mg/L(ppm)
3.5 mg/L to 5.5 mg/L to 5.5 mg/L(ppm)

Correct answer: less than 0 .1mg/L (ppm)

Chlorine and chloramines are highly toxic to hemodialysis patients, as they can cause hemolysis (destruction of red blood cells) if present in the dialysate. Therefore, strict standards are in place for water quality used in hemodialysis. The acceptable limit for total chlorines (chlorine and chloramines) in water for hemodialysis is extremely low, typically less than 0.1 mg/L (parts per million), to ensure patient safety.

Question 50: What is the purpose of the dialyzer in the dialysis machine?

To detect air in the blood
To remove toxins and fluid from blood (Correct answer)
To monitor blood pressure
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 51: What is the primary purpose of the softener in the dialysis water treatment system?

To remove chlorine and chloramines from the water supply
To remove calcium and magnesium ions to prevent scaling and protect the reverse osmosis membrane (Correct answer)
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 52: According to OSHA's Bloodborne Pathogens Standard, what is a key requirement for healthcare facilities like dialysis clinics?

Ensuring all staff are certified in advanced cardiac life support (ACLS).
Providing all patients with private treatment stations.
Using glass syringes and needles for all injections.
Offering the Hepatitis B vaccine to employees at no cost. (Correct answer)

Correct answer: Offering the Hepatitis B vaccine to employees at no cost.

The standard requires employers to make the Hepatitis B vaccine available to all employees who have occupational exposure to blood or other potentially infectious materials. This must be offered free of charge to the employee.

Question 53: A dialysis facility's monthly water culture result shows a bacterial count of 75 CFU/mL. What action is required?

This exceeds the maximum limit (200 CFU/mL) and patient treatments must be halted immediately
No action needed; this is within AAMI acceptable limits
Increase the frequency of water testing to weekly and continue patient treatments
This exceeds the action level (50 CFU/mL) and requires investigation, corrective action, and resampling (Correct answer)

Correct answer: This exceeds the action level (50 CFU/mL) and requires investigation, corrective action, and resampling

A bacterial count of 75 CFU/mL exceeds the AAMI action level of 50 CFU/mL but is below the maximum limit of 200 CFU/mL. This requires a formal investigation, corrective action (such as system disinfection), and re-testing to confirm the count returns below the action level.

Question 54: The capability of a dialyzer to remove fluid, expressed as ml/mmHg/hr is:

surface area
clearance
UF Coefficient (Correct answer)
priming volume

Correct answer: UF Coefficient

The Ultrafiltration (UF) Coefficient, also known as Kuf, quantifies a dialyzer's ability to remove fluid. It measures how many milliliters of fluid are removed per hour for every millimeter of mercury (mmHg) of transmembrane pressure applied. A higher UF coefficient indicates a more permeable membrane, allowing for more efficient fluid removal.

Question 55: How does single-needle dialysis differ from standard two-needle hemodialysis?

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

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 56: What is the most common source of catheter-related bloodstream infections (CRBSI) in hemodialysis patients?

Contamination of catheter hubs during connection/disconnection procedures (Correct answer)
Contaminated dialysate water
Skin flora migrating through the insertion site
Infected dialyzer membranes

Correct answer: Contamination of catheter hubs during connection/disconnection procedures

The majority of CRBSIs originate from contamination of catheter hubs during the frequent connection and disconnection required for hemodialysis.

Question 57: Which of the following is the earliest and most reliable sign of needle infiltration during a hemodialysis treatment?

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)
An increase in the arterial pressure alarm above baseline

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 58: A patient requests that a family member be present during dialysis treatment. What is the appropriate response?

Require the physician to authorize visitor presence
Deny the request as visitors disrupt treatment
Facilitate the request in accordance with facility policy; patient rights support having support persons present (Correct answer)
Allow visitors only during the last hour of treatment

Correct answer: Facilitate the request in accordance with facility policy; patient rights support having support persons present

CMS ESRD patient rights include the right to have visitors present during treatment within reasonable facility guidelines, and this request should be honored.

Question 59: 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 60: At minimum, how frequently should dialysis water be tested for bacteriological contamination according to AAMI guidelines?

Weekly
Monthly (Correct answer)
Daily
Quarterly

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 61: Which federal agency sets the Conditions for Coverage (CfC) that dialysis facilities must meet to receive Medicare reimbursement?

The Centers for Medicare & Medicaid Services (CMS) (Correct answer)
The Joint Commission (TJC)
The Food and Drug Administration (FDA)
The Occupational Safety and Health Administration (OSHA)

Correct answer: The Centers for Medicare & Medicaid Services (CMS)

CMS establishes the Conditions for Coverage (CfC) for ESRD facilities, which are the minimum health and safety standards facilities must meet to participate in the Medicare program. CMS conducts or oversees surveys to verify compliance.

Question 62: How do you assess the adequacy of dialysis?

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

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

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

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 64: A patient with a forearm AVF complains of pain, numbness, and weakness in the hand during dialysis treatments. The hand is cold and pale. What complication is most likely occurring?

Normal post-dialysis ischemia that resolves spontaneously
Hypocalcemia-induced muscle cramps
Carpal tunnel syndrome from B2M deposits
Distal access ischemia (steal syndrome) requiring surgical evaluation (Correct answer)

Correct answer: Distal access ischemia (steal syndrome) requiring surgical evaluation

Cold, pale, painful hand during dialysis with AVF is characteristic of steal syndrome, where the high-flow fistula diverts blood away from the hand.

Question 65: What is the maximum allowable bacterial count in dialysis water per AAMI standards?

10 CFU/mL (no action level)
200 CFU/mL (action level 50 CFU/mL) (Correct answer)
100 CFU/mL (action level 10 CFU/mL)
1,000 CFU/mL (action level 500 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 66: Which of the following is an important teaching point about exercising with an AVF or AVG?

The access arm should be completely immobilized
Avoid all upper body exercise permanently
Swimming is prohibited due to infection risk at the access site
Light to moderate exercise is encouraged but avoid contact sports (Correct answer)

Correct answer: Light to moderate exercise is encouraged but avoid contact sports

Light to moderate exercise including the access arm is generally encouraged, but contact sports that could traumatize the access site should be avoided.

Question 67: A hemodialysis technician suspects that a patient who is receiving a hemodialysis treatment has an air embolus. After stopping the blood pump, the patient should be placed in which of these positions?

Left-sided Trendelenburg (Correct answer)
High-fowlers
Right-sided Trendelenburg
Low-fowlers

Correct answer: Left-sided Trendelenburg

In the event of a suspected air embolus, placing the patient in a left-sided Trendelenburg position is a critical intervention. This position helps to trap the air in the right ventricle, preventing it from traveling into the pulmonary circulation and causing a pulmonary embolism. This allows time for the air to be reabsorbed or for medical intervention to remove it, minimizing the risk of severe complications.

Question 68: What action should a technician take if the air detector alarm activates during hemodialysis?

Clamp the venous line and stop the blood pump immediately (Correct answer)
Remove the patient from the circuit gently
Silence the alarm and continue treatment
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 69: Under CMS Conditions for Coverage, what is required regarding informed consent for hemodialysis treatment?

Consent is required only for new procedures or changes to the treatment plan, not for routine dialysis
Informed consent is the nephrologist's sole responsibility and does not involve dialysis technicians
Written consent is needed only for patients who are incompetent to consent verbally
Informed consent must be documented before initiating treatment, with the patient having the right to refuse or withdraw consent at any time (Correct answer)

Correct answer: Informed consent must be documented before initiating treatment, with the patient having the right to refuse or withdraw consent at any time

CMS CfC requires that patients provide informed consent prior to treatment, with documentation in the medical record. Patients retain the right to refuse or withdraw consent at any time, even mid-treatment, with appropriate documentation of the refusal and consequences discussed.

Question 70: The continuous quality improvement method known as the PDCA cycle is known as.

pick-direct-certify-act.
plan-direct-commence-account.
pick-do-certify-account.
plan-do-check-act. (Correct answer)

Correct answer: plan-do-check-act.

The following steps are referred to as part of the plan-do-check-act cycle for continuous quality improvement: Plan: Describe a strategy for resolving a particular issue, including steps to take, to-do lists, and desired results. Do: Test the action plan's viability and suitability by implementing it partially or on a trial basis. Check: Assess the plan's effectiveness and make any necessary adjustments in light of the findings. Utilize the action plan, and keep reevaluating as needed.

Question 71: Before cannulating a patient's arteriovenous fistula (AVF), which assessment finding confirms the access is patent and ready for use?

Absence of bruit on auscultation and absence of thrill on palpation
Skin discoloration and warmth directly over the fistula site
A firm, non-compressible vessel wall with no pulsation
Presence of bruit on auscultation and thrill on palpation (Correct answer)

Correct answer: Presence of bruit on auscultation and thrill on palpation

A functioning AVF produces turbulent blood flow that is felt as a thrill (vibration on palpation) and heard as a bruit (swooshing sound on auscultation). Absence of either finding suggests thrombosis or inadequate flow and must be reported before cannulation.

Question 72: Why must hemodialysis machines undergo disinfection between patient treatments?

To recalibrate the pressure sensors for accuracy
To eliminate biofilm and pathogens that could contaminate future patients' blood circuits (Correct answer)
To remove residual dialysate that would alter the next patient's treatment
To remove mineral deposits that reduce machine efficiency

Correct answer: To eliminate biofilm and pathogens that could contaminate future patients' blood circuits

Machine disinfection destroys biofilm and pathogens in internal fluid pathways that could contaminate blood circuits and cause bloodstream infections in subsequent patients.

Question 73: What does a decrease in the bruit (audible sound) of an arteriovenous fistula suggest?

Normal variation that does not require reporting
Increased blood flow through the fistula from high blood pressure
The fistula has matured and is functioning optimally
Possible stenosis or early thrombosis of the fistula (Correct answer)

Correct answer: Possible stenosis or early thrombosis of the fistula

A decrease or change in the bruit of an AV fistula—particularly a change from a soft, continuous, low-pitched bruit to a high-pitched, discontinuous, or absent sound—indicates reduced blood flow, which may be due to stenosis or early thrombosis. This is a critical finding that must be reported immediately.

Question 74: During dialysis, the blood leak detector alarm activates. What does this indicate and what action should be taken?

Blood is crossing into the dialysate side; stop treatment and do not return blood (Correct answer)
Patient blood pressure is dropping; administer saline bolus
The dialysate is too concentrated; dilute with water
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 75: Who developed the first permanent blood access, the "Shunt"?

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

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 76: When managing a patient with dialysis disequilibrium syndrome, which dialysis modification is most important to prevent recurrence in future treatments?

Increase dialysate bicarbonate to correct acidosis faster
Use a larger surface area dialyzer for more efficient clearance
Use shorter, more frequent treatments with lower blood flow rates initially for new patients (Correct answer)
Use a higher dialysate sodium concentration

Correct answer: Use shorter, more frequent treatments with lower blood flow rates initially for new patients

Dialysis disequilibrium is caused by too-rapid urea removal creating osmotic gradients; prevention involves slower, incremental dialysis for new patients.

Question 77: Chloramine is particularly dangerous in dialysis water because it can cause which serious complication?

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

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

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

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 79: Which electrolyte imbalance can result in confusion, seizures, or coma?

Hypermagnesemia
Hyponatremia (Correct answer)
Hyperkalemia
Hypocalcemia

Correct answer: Hyponatremia

Hyponatremia, or low sodium levels in the blood, can cause water to shift into brain cells, leading to cerebral edema. This swelling can manifest as severe neurological symptoms ranging from confusion and lethargy to seizures and coma. It is a serious electrolyte imbalance requiring careful and immediate management in dialysis patients.

Question 80: A patient's urine output has decreased from 300 mL/day to 50 mL/day over the past month. What is the clinical implication for their dialysis management?

Urine output is irrelevant once on dialysis; no changes needed
This indicates the dialysis is too effective and should be reduced
Fluid restriction should be liberalized since the patient needs fluids
Residual kidney function is declining; dialysis prescription may need to be intensified (Correct answer)

Correct answer: Residual kidney function is declining; dialysis prescription may need to be intensified

Loss of residual kidney function requires increasing dialysis dose to compensate, as the kidneys contributed to overall clearance and fluid removal.

Question 81: A dialyzer arrives at the reprocessing area and is found to have a crack in the header cap. What is the correct action?

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
Repair the crack with medical-grade adhesive before reprocessing

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 82: What symptom is associated with hyperkalemia?

Muscle weakness (Correct answer)
Dry skin
Excessive sweating
Hiccups

Correct answer: Muscle weakness

Hyperkalemia (high potassium) can disrupt the electrical signals in muscle cells, leading to muscle weakness, fatigue, and even paralysis. More dangerously, it can severely impair cardiac muscle function, causing life-threatening arrhythmias. Therefore, muscle weakness is a significant symptom indicating dangerously high potassium levels that require immediate attention.

Question 83: In a non-urgent clinical situation, how long should a technician typically wait before cannulating a newly placed synthetic AV graft?

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

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 84: 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?

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

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

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

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

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

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 87: Which of the following foods should a hemodialysis patient most strictly limit to prevent hyperkalemia?

Bananas, oranges, and potatoes (Correct answer)
Brown rice and oatmeal
Eggs and lean chicken breast
White bread and pasta

Correct answer: Bananas, oranges, and potatoes

Bananas, oranges, and potatoes are among the highest-potassium foods. Hemodialysis patients must limit high-potassium foods to prevent dangerous hyperkalemia, as dialysis is the primary route of potassium excretion in the absence of significant residual renal function.

Question 88: Before returning a reprocessed dialyzer to a patient, which test must be performed to ensure patient safety?

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

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

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

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

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

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 91: A patient has been advised to avoid foods high in phosphorus. Foods that the patient should be advised to limit include:

Fresh fruits
Dairy products (Correct answer)
Leafy green vegetables
Whole grains

Correct answer: Dairy products

Patients with kidney disease often need to limit phosphorus intake because their kidneys cannot effectively remove excess phosphorus from the blood, leading to hyperphosphatemia. Dairy products such as milk, cheese, and yogurt are naturally high in phosphorus. Therefore, advising patients to limit these foods is a crucial dietary intervention to manage phosphorus levels and prevent complications like bone disease.

Question 92: Which parameter must be verified before connecting a patient to the hemodialysis machine?

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

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

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

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 94: Which of the following actions by a CCHT would be a violation of HIPAA?

Accessing the medical record of a patient assigned to another technician out of curiosity. (Correct answer)
Discussing a patient's lab results with the charge nurse in a private office.
Documenting treatment details in the patient's official medical chart.
Using a patient's name when calling them from the waiting room.

Correct answer: Accessing the medical record of a patient assigned to another technician out of curiosity.

HIPAA's 'minimum necessary' rule states that healthcare workers should only access the protected health information (PHI) necessary to perform their job duties. Accessing the chart of a patient not under your care is a serious violation.

Question 95: What should you check after dialysis has finished?

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

Correct answer: Check for signs of bleeding

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 96: 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
Increase the pump speed to overcome the resistance
Accept -250 mmHg as normal for new fistulas
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)

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 97: During routine water testing, the technician notes that the chloramine level after the first carbon tank is 0.2mg/L. Which of these actions should the technician take next?

Obtain a sample after the second (Correct answer)
Immediately terminate hemodialysis treatments
Descale the reverse osmosis membranes
Bypass the carbon tanks

Correct answer: Obtain a sample after the second

Carbon tanks are used in series to remove chlorine and chloramine from the water. If the chloramine level is detected after the first carbon tank, it indicates that the first tank is becoming saturated or is not fully effective. The next step is to check the water after the second carbon tank to ensure that the chloramines are completely removed before the water reaches the patient, as the second tank acts as a safeguard.

Question 98: What must be done before disconnecting a patient from dialysis?

Return the patient's blood and remove needles (Correct answer)
Shut down the dialysis machine
Drain the dialyzer
Turn off the water supply

Correct answer: Return the patient's blood and remove needles

Before disconnecting, it is crucial to return all the patient's blood from the extracorporeal circuit (bloodlines and dialyzer) back into their body to prevent blood loss. Once the blood return is complete, the needles can be safely removed from the vascular access site. This sequence ensures patient safety and minimizes complications such as bleeding or air embolism.

Question 99: 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 100: What is the typical duration of a hemodialysis treatment?

3 to 5 hours (Correct answer)
2 to 3 hours
6 to 8 hours
1 to 2 hours

Correct answer: 3 to 5 hours

Hemodialysis treatments typically last 3 to 5 hours, performed three times a week. This duration is necessary to allow sufficient time for the dialyzer to effectively remove accumulated waste products, toxins, and excess fluid from the patient's blood. The specific duration is tailored to the individual patient's needs, kidney function, and fluid status to achieve optimal clearance.

Question 101: A pre-pump arterial pressure reading is measuring:

None of the above
pressure within the dialyzer
the pressure required to pump the blood through the dialyzer
resistance to blood flow out of the access (Correct answer)

Correct answer: resistance to blood flow out of the access

A pre-pump arterial pressure reading is taken between the patient's access and the blood pump, reflecting the negative pressure required to pull blood from the access. This measurement indicates the resistance to blood flow out of the access. A more negative reading suggests increased resistance, potentially due to issues like needle occlusion, vasospasm, or access stenosis.

Question 102: What does a failed pressure test during dialyzer reprocessing indicate?

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

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

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
Flow >800 mL/min, diameter ≥8 mm, depth ≤4 mm, maturation ≥8 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 104: During a hemodialysis treatment, the blood leak detector alarms. What is the technician's immediate first action?

Administer a saline bolus
Visually inspect the dialysate for blood (Correct answer)
Stop the blood pump immediately
Return the patient's blood

Correct answer: Visually inspect the dialysate for blood

The first step is to confirm the alarm by visually checking the dialysate effluent line for a pink or red tinge. If blood is present, it confirms a membrane leak, and the treatment must be stopped immediately without returning the blood to the patient to prevent contamination.

Question 105: What does the UF goal represent and how is it determined for each treatment?

The volume of saline to be administered during treatment
The dialyzer clearance capacity for urea
The maximum blood flow rate achievable during treatment
The total volume of fluid to be removed, calculated from weight gain since last treatment (Correct answer)

Correct answer: The total volume of fluid to be removed, calculated from weight gain since last treatment

The UF goal is the total fluid volume to be removed, determined by subtracting the patient's dry weight from their current pre-dialysis weight.

Question 106: Which of the following affects access recirculation?

Distance between the tips of the needles
Presence of stenosis
All of the above (Correct answer)
Direction of needles

Correct answer: All of the above

Access recirculation occurs when dialyzed blood re-enters the arterial needle, reducing dialysis efficiency. The distance between the needle tips (too close), the presence of stenosis (narrowing) in the access, and the direction of the needles (reversed or improperly placed) all contribute to recirculation. Understanding and managing these factors are crucial for optimizing dialysis treatment and ensuring adequate solute clearance.

Question 107: 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?

Pulmonary embolism from DVT
Severe hypotension causing tissue hypoperfusion
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 108: A patient who has an AV graft for vascular access arrives for dialysis and the graft feels very firm, rope-like, and pulsatile throughout with no audible bruit. What does this finding suggest?

The graft has matured well and has excellent blood flow
High blood pressure is causing increased graft pressure—lower blood pressure before cannulation
This is a normal finding in a graft that has been in place for more than 2 years
The graft is likely thrombosed (clotted), and treatment should be delayed while the access is evaluated (Correct answer)

Correct answer: The graft is likely thrombosed (clotted), and treatment should be delayed while the access is evaluated

A thrombosed AV graft typically feels firm and pulsatile (transmitted cardiac pulsation without actual flow) without the continuous thrill or bruit of a patent graft. Absence of bruit and thrill strongly suggests thrombosis. The technician should not cannulate the graft and must notify the nurse immediately.

Question 109: What is the best way to explain the concept of dry weight to a new dialysis patient?

The weight when you are dehydrated
The weight without clothing and shoes
The target weight after all excess fluid is removed during dialysis (Correct answer)
The weight you had before kidney disease began

Correct answer: The target weight after all excess fluid is removed during dialysis

Dry weight is the target post-dialysis weight representing the patient's ideal fluid balance with all excess fluid removed.

Question 110: According to AAMI standards, what is the maximum allowable endotoxin level in water used for standard hemodialysis?

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

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 111: What does the conductivity test of dialysate measure, and why is it important?

The pH of the dialysate to prevent acid-base disturbances in patients
The total dissolved solute concentration of the dialysate, confirming correct electrolyte mixing (Correct answer)
The temperature of the dialysate to ensure patient comfort
The bacterial load of the dialysate to detect contamination

Correct answer: The total dissolved solute concentration of the dialysate, confirming correct electrolyte mixing

Dialysate conductivity measures the total ionic concentration of the dialysate, which serves as a proxy for correct electrolyte composition (sodium, potassium, calcium, magnesium, bicarbonate). It confirms that concentrate and water are being mixed at the correct proportions.

Question 112: What is the appropriate response when a dialysis patient develops seizures during treatment?

Protect the patient from injury, stop UF, reduce blood pump speed, notify nurse/physician, and prepare to terminate treatment (Correct answer)
Restrain the patient to prevent injury and continue treatment
Increase blood pump speed to improve cerebral perfusion
Administer IV diazepam immediately without notifying the physician

Correct answer: Protect the patient from injury, stop UF, reduce blood pump speed, notify nurse/physician, and prepare to terminate treatment

Seizures during dialysis require patient protection from injury, immediate reduction in treatment intensity, and urgent notification of the nurse and physician.

Question 113: Choose the correct statement regarding serum abnormalities in renal failure:

calcium and bicarbonate are depressed
calcium and bicarbonate are elevated
creatinine BUN creatinine, BUN, and phosphorus are depressed
creatinine, BUN, and phosphorus are elevated (Correct answer)

Correct answer: creatinine, BUN, and phosphorus are elevated

In renal failure, the kidneys lose their ability to effectively filter waste products from the blood. As a result, metabolic waste products such as creatinine and blood urea nitrogen (BUN) accumulate, leading to elevated levels. Additionally, the kidneys are crucial for phosphorus excretion, so phosphorus levels also become elevated (hyperphosphatemia) in patients with impaired kidney function.

Question 114: What is the function of a deionizer (DI unit) in a dialysis water treatment system?

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

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

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

Correct answer: Iron sucrose

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

Question 116: As part of anemia management for patients receiving hemodialysis, the technician should ____________.

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

Correct answer: rinse back as much blood as possible

Anemia is a significant concern 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 117: 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?

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

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 118: Chloramine exposure in dialysis can result in:

pericarditis
hemolysis (Correct answer)
bleeding
hypernatremia

Correct answer: hemolysis

Chloramines, used as disinfectants in tap water, must be completely removed from dialysis water. If chloramines enter the patient's bloodstream, they cause oxidative damage to red blood cells, leading to hemolysis. This rupture of red blood cells can result in severe anemia and other serious complications for the patient.

Question 119: During dialysis, you observe bubbles in the venous blood line. What should you do immediately?

Notify the biomedical technician to inspect the machine
Increase the saline flush rate to push bubbles through
Clamp the venous line and stop the blood pump immediately (Correct answer)
Slow the blood pump rate to allow bubbles to disperse

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

Visible air bubbles in the venous blood line is a potential air embolism emergency. The venous line must be clamped and the blood pump stopped immediately to prevent air from entering the patient's circulation, which can be fatal.

Question 120: What should be done if the machine fails the alarm test?

Ask the patient to wait
Tag and remove from service (Correct answer)
Reboot the machine
Ignore and continue

Correct answer: Tag and remove from service

If a dialysis machine fails the alarm test, it must be tagged and immediately removed from service. A failed alarm test indicates that the machine cannot reliably alert staff to critical issues, such as blood leaks or air in the line, posing a significant patient safety risk. Using a malfunctioning machine could lead to severe complications or even death.

Question 121: The required contact time for dialyzer reprocessing in a dialysis facility using peracetic acid as the germicide is ____________.

10 hours.
20 hours.
24 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 122: What is the steal phenomenon in the context of vascular access, and which patient population is at highest risk?

A complication only seen with central venous catheters
Access blood flow stealing from cardiac output causing hypotension
Blood stealing from the circuit due to high blood pump speeds
Diversion of arterial blood flow away from the distal extremity by the low-resistance access, causing ischemia; highest risk in diabetics and elderly with peripheral vascular disease (Correct answer)

Correct answer: Diversion of arterial blood flow away from the distal extremity by the low-resistance access, causing ischemia; highest risk in diabetics and elderly with peripheral vascular disease

Steal syndrome occurs when the low-resistance AV access preferentially carries blood flow away from the hand/fingers; diabetics and those with peripheral vascular disease are at highest risk due to pre-existing distal ischemia.

Question 123: What is the primary purpose of the Total Cell Volume (TCV) or Fiber Bundle Volume (FBV) test during dialyzer reprocessing?

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

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 124: What lab values are monitored for assessing bone disease?

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

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

Eliminate bacteria and endotoxins through UV irradiation
Adsorb chlorine and chloramines before water reaches the RO membrane (Correct answer)
Remove calcium and magnesium ions through ion exchange
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 126: During hemodialysis, a patient goes into cardiac arrest. Which of these actions should be taken first?

Return the patient's blood
Stop ultrafiltration
Apply a precordial thump to the patient
Call for help (Correct answer)

Correct answer: Call for help

In any medical emergency, especially a life-threatening event like cardiac arrest, the immediate priority is to activate the emergency response system and call for help. This ensures that trained personnel and necessary equipment (like a defibrillator) arrive quickly to initiate resuscitation efforts. While other actions like stopping ultrafiltration or returning blood may be necessary, they are secondary to securing immediate assistance.

Question 127: What is the purpose of the deaeration chamber system in a hemodialysis machine?

Remove dissolved gases from dialysate before patient contact (Correct answer)
Cool the dialysate to proper temperature
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 128: Which of the following best describes the purpose of pressure testing a dialyzer during reprocessing?

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

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

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

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

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

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

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

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 132: Which AAMI standard specifically governs dialyzer reprocessing for hemodialysis?

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

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

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

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 134: 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?

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

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 135: What is the significance of a BUN:creatinine ratio greater than 20:1 in a dialysis patient?

It indicates excellent dialysis adequacy with efficient urea removal
It is a normal finding in all stable dialysis patients
It suggests a catabolic state, gastrointestinal bleeding, or high dietary protein intake (Correct answer)
It indicates the patient is anuric and all nitrogen waste is dialysis-dependent

Correct answer: It suggests a catabolic state, gastrointestinal bleeding, or high dietary protein intake

A BUN:creatinine ratio >20:1 in a dialysis patient suggests either excessive protein catabolism, upper gastrointestinal bleeding (where blood protein is digested and absorbed as urea), or very high dietary protein intake—all of which disproportionately raise BUN relative to creatinine.

Question 136: A hemodialysis patient receives intravenous sodium bicarbonate during treatment. What is the primary indication for this medication?

Hyperphosphatemia
Metabolic acidosis (Correct answer)
Hypernatremia
Hypercalcemia

Correct answer: Metabolic acidosis

IV sodium bicarbonate is administered to correct metabolic acidosis, which is common in end-stage renal disease patients.

Question 137: A conductivity alarm sounds during a hemodialysis treatment. The technician should expect which of these events to have occurred:

The blood pump has stopped
The dialysate flow rate has increased
The dialyzer was bypassed (Correct answer)
The electrical power source was interrupted

Correct answer: The dialyzer was bypassed

A conductivity alarm indicates that the dialysate's electrolyte concentration is outside the safe range, which could harm the patient. When this alarm sounds, the hemodialysis machine is designed to automatically bypass the dialyzer, preventing the unsafe dialysate from reaching the patient's blood. This safety mechanism ensures that treatment is temporarily halted until the conductivity issue is resolved.

Question 138: Which physical finding during pre-treatment assessment most specifically indicates arterial steal syndrome in a patient with a new upper arm AVF?

Diminished thrill in the fistula
Edema in the ipsilateral hand
Elevated blood pressure in the access arm
Cold, pale hand that warms when the fistula is manually compressed (Correct answer)

Correct answer: Cold, pale hand that warms when the fistula is manually compressed

Hand ischemia (cold, pale) that resolves when the fistula is compressed (reducing steal) is pathognomonic for arterial steal syndrome.

Question 139: During the reprocessing procedure, what is the purpose of the 'reverse ultrafiltration' step?

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

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 140: When educating a patient about dietary restrictions during hemodialysis, which nutrient is most commonly restricted to prevent dangerous fluid buildup between sessions?

Sodium (Correct answer)
Iron
Fiber
Vitamin C

Correct answer: Sodium

Sodium restriction is critical for hemodialysis patients to control thirst and limit fluid intake between sessions, preventing dangerous fluid overload.

Question 141: What is the recommended action if there is an air embolism during dialysis?

Place the patient in Trendelenburg position (Correct answer)
Continue dialysis
Increase blood flow rate
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 142: 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 143: Which medication is used to reverse the anticoagulant effects of heparin in cases of overdose or emergency bleeding?

Vitamin K
Fresh frozen plasma
Tranexamic acid
Protamine sulfate (Correct answer)

Correct answer: Protamine sulfate

Protamine sulfate binds and neutralizes heparin, rapidly reversing its anticoagulant effect.

Question 144: What is the primary reason dialyzer reuse programs require each patient to have their own dedicated dialyzer?

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

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 145: A patient receiving hemodialysis develops sudden loss of consciousness and is unresponsive. What is the first step in the emergency response?

Return the patient's blood immediately before calling for help
Administer 50% dextrose IV in case of hypoglycemia
Call for help and activate the emergency response system (call code) (Correct answer)
Lower the patient's chair and elevate the legs

Correct answer: Call for help and activate the emergency response system (call code)

When a patient becomes unresponsive, the first priority is calling for help and activating the emergency response system. The patient needs immediate assessment and potentially CPR, defibrillation, or other advanced interventions that require a team response.

Question 146: The primary reason for restricting sodium intake for patients on hemodialysis is to:

Control thirst and fluid intake. (Correct answer)
Prevent hyperkalemia.
Improve protein absorption.
Lower serum phosphorus levels.

Correct answer: Control thirst and fluid intake.

Sodium intake is a primary driver of thirst. By restricting sodium, patients can better manage their thirst, which in turn helps control their fluid intake and limit interdialytic weight gain, reducing the risk of fluid overload.

Question 147: Compared to the general population, the protein needs of a patient on maintenance hemodialysis are typically:

Significantly lower.
Dependent only on their age.
The same.
Higher. (Correct answer)

Correct answer: Higher.

Patients on hemodialysis have higher protein requirements because some amino acids and proteins are lost during the dialysis process. A high-protein diet is essential to maintain muscle mass and overall nutritional status.

Question 148: A new patient has been identified as hepatitis C positive. What infection control precautions should be implemented in the hemodialysis unit?

Isolate the patient in a separate room with dedicated equipment
Cohort the patient with other HCV-positive patients and use dedicated machines (Correct answer)
Refuse treatment until the patient completes antiviral therapy
Follow standard precautions only; HCV is not transmitted by casual contact in dialysis

Correct answer: Cohort the patient with other HCV-positive patients and use dedicated machines

CDC recommends cohorting HCV-positive patients in a dedicated area or machine due to hemodialysis-specific transmission risks, in addition to standard precautions.

Question 149: During a routine hemodialysis treatment, the venous pressure alarm sounds repeatedly and the reading shows persistently elevated pressure. What is the most likely cause?

A clot or kink in the venous blood return line or access (Correct answer)
The blood pump speed is set below the prescribed rate
The dialysate flow rate is too high
The dialyzer membrane has ruptured causing back-filtration

Correct answer: A clot or kink in the venous blood return line or access

Persistently elevated venous pressure indicates increased resistance in the blood return path from the dialyzer to the patient. The most common causes are a kink in the venous line, clotting in the venous line or venous needle, or outflow resistance at the vascular access (stenosis, needle malposition).

Question 150: What does the conductivity of dialysate measure?

Water flow rate
Temperature level
Electrical output
Electrolyte concentration (Correct answer)

Correct answer: Electrolyte concentration

Conductivity measures the ability of a solution to conduct an electrical current, which directly correlates with the concentration of charged particles (electrolytes) within it. In dialysate, accurate conductivity ensures the correct balance of sodium, potassium, and other electrolytes, crucial for effective waste removal and preventing electrolyte imbalances in the patient. Deviations can indicate an improperly mixed dialysate, posing a significant risk to the patient.

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

Questions

180 min

Time Limit

70%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds