Question 1: Hemolysis, the rupture of red blood cells, is a serious complication. Which of the following is a potential cause of hemolysis during dialysis?

• Low blood pump speed
• Dialysate temperature being too high (Correct answer)
• A clotted venous chamber
• High ultrafiltration rate

Correct answer: Dialysate temperature being too high

Red blood cells are sensitive to temperature. If the dialysate temperature is excessively high (e.g., above 42°C), it can cause the cells to rupture, a condition known as hemolysis. Other causes include hypotonic dialysate, kinks in the blood lines, or exposure to chemicals like bleach or chlorine.

Question 2: What is the relationship between vitamin D deficiency and calcium/phosphorus imbalance in ESRD?

• Vitamin D deficiency directly causes hyperphosphatemia
• Vitamin D deficiency impairs intestinal calcium absorption, promoting hypocalcemia and secondary hyperparathyroidism (Correct answer)
• Vitamin D has no role in calcium regulation in dialysis patients
• Vitamin D deficiency causes hypernatremia

Correct answer: Vitamin D deficiency impairs intestinal calcium absorption, promoting hypocalcemia and secondary hyperparathyroidism

The kidneys activate vitamin D, and in ESRD, this activation fails, reducing intestinal calcium absorption and triggering secondary hyperparathyroidism.

Question 3: Which physical finding during pre-treatment assessment most specifically indicates arterial steal syndrome in a patient with a new upper arm AVF?

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

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 4: Why are bacterial and endotoxin tests performed on product water?

• To detect contamination (Correct answer)
• To monitor volume
• To check taste
• To reduce chlorine

Correct answer: To detect contamination

Bacterial and endotoxin tests are performed on product water to detect contamination, which is vital for patient safety in dialysis. Contaminated water can lead to severe infections, inflammatory responses, or pyrogenic reactions in patients, as large volumes of water come into direct contact with their blood. These tests ensure the water meets stringent purity standards.

Question 5: What is the purpose of administering normal saline (0.9% NaCl) boluses during a hemodialysis session?

• Flush excess potassium
• Reduce blood urea nitrogen
• Correct hypernatremia
• Treat intradialytic hypotension (Correct answer)

Correct answer: Treat intradialytic hypotension

Normal saline boluses are given during dialysis to treat intradialytic hypotension by rapidly expanding intravascular volume.

Question 6: If an air embolism is suspected, in addition to stopping the blood pump, what is the correct position to place the patient in?

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

Correct answer: Trendelenburg position on the left side

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

Question 7: Before a reprocessed dialyzer is used for a patient's treatment, what is the most critical final check that must be performed at the patient's station?

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

Correct answer: Testing for residual sterilant

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

Question 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?

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

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

• Sterilize the dialysate before patient contact
• Mix acid and bicarbonate concentrates with purified water to create dialysate (Correct answer)
• Control the rate of potassium removal from blood
• 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 10: What is the role of the ultrafiltration pump in dialysis?

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

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

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

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

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

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 13: The Occupational Safety and Health Administration (OSHA) is primarily concerned with which of the following in a dialysis clinic?

• The adequacy of the dialysis prescription.
• Patient grievance procedures.
• Billing and reimbursement rates.
• Staff and patient safety from workplace hazards. (Correct answer)

Correct answer: Staff and patient safety from workplace hazards.

OSHA's mission is to ensure safe and healthful working conditions. In a dialysis clinic, this includes enforcing standards for bloodborne pathogens, chemical handling, personal protective equipment (PPE), and electrical safety.

Question 14: What does the albumin level in a dialysis patient primarily reflect?

• Hydration status and fluid balance
• Adequacy of dialysis delivery
• Nutritional status and inflammation (Correct answer)
• Renal osteodystrophy severity

Correct answer: Nutritional status and inflammation

Serum albumin primarily reflects nutritional status and the presence of inflammation (acute phase response). In dialysis patients, low albumin (<3.5 g/dL) is strongly associated with increased mortality and reflects either protein-calorie malnutrition, systemic inflammation, or both.

Question 15: What is the physiological consequence of using dialysate with a calcium concentration lower than the patient's serum calcium?

• Calcium will move from dialysate into blood, raising serum calcium
• Phosphorus will increase to compensate for calcium loss
• No change occurs because calcium does not cross the dialyzer membrane
• Calcium will move from blood into dialysate, potentially lowering serum calcium (Correct answer)

Correct answer: Calcium will move from blood into dialysate, potentially lowering serum calcium

When dialysate calcium is lower than serum calcium, the concentration gradient causes calcium to diffuse out of the blood into the dialysate, lowering serum levels.

Question 16: Which reagent is used in the standard colorimetric test to check for free chlorine residual in dialysis water?

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

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

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

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

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

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

• Calcium, phosphorus and PTH (Correct answer)
• Calcium, phosphorus and magnesium
• 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 20: According to AAMI standards, what is the maximum allowable endotoxin level in water used for standard hemodialysis?

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

Correct answer: 2 EU/mL

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

Question 21: What should you check after dialysis has finished?

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

Correct answer: All of the above

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

Question 22: A patient on erythropoiesis-stimulating agents (ESAs) has a hemoglobin of 13.5 g/dL during a routine check. What is the concern and appropriate action?

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

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

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

Question 23: When educating a new patient about their arteriovenous (AV) fistula, what is the most important daily self-care check they should be taught to perform?

• Feel for the 'thrill' and listen for the 'bruit' (Correct answer)
• Apply ice packs to the fistula after every treatment
• Check their blood pressure in the access arm
• Measure the circumference of their access arm daily

Correct answer: Feel for the 'thrill' and listen for the 'bruit'

The 'thrill' (a palpable vibration) and the 'bruit' (an audible whooshing sound) are signs of good blood flow through the fistula. Teaching the patient to check for these daily helps in the early detection of potential problems like clotting or stenosis, which could lead to access failure.

Question 24: Before administering IV iron during dialysis, which assessment is most important to perform?

• Check patient weight
• Measure blood pressure
• Check blood glucose level
• Assess for signs of anaphylaxis risk and verify allergy history (Correct answer)

Correct answer: Assess for signs of anaphylaxis risk and verify allergy history

Assessing allergy history and anaphylaxis risk is critical before IV iron administration because hypersensitivity reactions can occur.

Question 25: Which of the following non-prescription remedies might help treat symptoms if a patient complains of chronic itching?

• Take oatmeal baths. (Correct answer)
• Apply rubbing alcohol.
• Take cold showers.
• 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 26: What is the primary reason dialyzer reuse programs require each patient to have their own dedicated dialyzer?

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

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 27: Which of the following dialysis complications requires the technician to stop the blood pump and clamp the lines WITHOUT returning blood to the patient?

• Dialysis disequilibrium syndrome
• Intradialytic hypotension
• Muscle cramps
• Suspected hemolysis from contaminated dialysate (Correct answer)

Correct answer: Suspected hemolysis from contaminated dialysate

In suspected hemolysis from contaminated dialysate (evidenced by pink or cherry-red blood in the venous line, patient symptoms of hemolytic reaction), the blood must NOT be returned to the patient. Returning contaminated hemolyzed blood can cause fatal hyperkalemia and cardiovascular collapse.

Question 28: During a water quality check, the RO product water conductivity reading is 45 μS/cm, significantly higher than the baseline of 8 μS/cm. What does this most likely indicate?

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

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

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

Question 29: What is the appropriate intervention for a patient with signs of an allergic reaction during dialysis?

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

Correct answer: Stop dialysis and notify nurse

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

Question 30: What is the purpose of the dialyzer in the dialysis machine?

• To monitor blood pressure
• To detect air in the blood
• To remove toxins and fluid from blood (Correct answer)
• 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 31: What is the purpose of the deaeration chamber system in a hemodialysis machine?

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

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 32: What is the purpose of recirculation assessment during hemodialysis, and when would it occur?

• Recirculation means the dialyzer is removing too much waste
• Recirculation is normal and indicates the fistula is working
• It is a technique to improve clearance of large molecules
• It occurs when returned blood immediately re-enters the arterial needle, reducing treatment efficiency (Correct answer)

Correct answer: It occurs when returned blood immediately re-enters the arterial needle, reducing treatment efficiency

Access recirculation occurs when already-dialyzed blood from the venous needle re-enters the arterial needle, reducing treatment efficacy by diluting the blood being presented to the dialyzer.

Question 33: What is the first step in preparing a dialysis machine for treatment?

• Check the machine settings and perform safety checks (Correct answer)
• Start dialysate flow
• Insert the needles into the patient
• Begin blood pump operation

Correct answer: Check the machine settings and perform safety checks

Before connecting a patient to the dialysis machine, ensuring its proper and safe operation is paramount. This involves verifying all machine settings, performing necessary safety checks, and confirming alarm functionality. This critical first step prevents potential harm to the patient and guarantees that the treatment will be delivered accurately and effectively according to the prescription.

Question 34: What is the purpose of administering vitamin D analogs (e.g., calcitriol) to hemodialysis patients?

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

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

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

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

• Sodium Hypochlorite
• Peracetic Acid (Correct answer)
• Glutaraldehyde
• Formaldehyde

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 37: A patient's granddaughter calls the dialysis center and asks for a progress report on her father, who is a patient in the center. The technician should:

• State that patient information cannot be divulged. (Correct answer)
• Ask for the patient's permission before sharing any information with the granddaughter.
• Provide the granddaughter with a detailed update on her father's condition.
• Request the granddaughter to come to the center to discuss the information in person.

Correct answer: State that patient information cannot be divulged.

Patient information is strictly protected under the Health Insurance Portability and Accountability Act (HIPAA). Healthcare professionals are legally and ethically bound to maintain patient confidentiality. Without explicit written consent from the patient, no medical information, including progress reports, can be shared with family members, even close relatives like a granddaughter.

Question 38: The Urea Reduction Ratio (URR) is a primary method used to measure:

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

Correct answer: The adequacy of a hemodialysis treatment.

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

Question 39: Why is potassium balance important in dialysis patients?

• It affects heart rhythm (Correct answer)
• It regulates breathing
• It supports kidney filtration
• It prevents nausea

Correct answer: It affects heart rhythm

Potassium plays a crucial role in nerve and muscle cell function, particularly in the heart. Both excessively high (hyperkalemia) and low (hypokalemia) potassium levels can cause dangerous arrhythmias, leading to cardiac arrest. Therefore, maintaining potassium balance through dialysis and dietary management is vital for preventing life-threatening heart complications in dialysis patients.

Question 40: A conductivity alarm sounds during a hemodialysis treatment. The technician should expect which of these events to have occurred:

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

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

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

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

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

Correct answer: 5 cm

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

Question 43: As part of anemia management for patients receiving hemodialysis, the technician should ___________.

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

Correct answer: rinse back as much blood as possible

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

Question 44: How often should vascular access sites be monitored during dialysis?

• Every hour
• Once per week
• Before, during, and after dialysis (Correct answer)
• Only before dialysis

Correct answer: Before, during, and after dialysis

Vascular access sites are the patient's lifeline for dialysis, making continuous monitoring essential. Checking before, during, and after treatment allows for early detection of complications like infiltration, infection, or clotting. This proactive approach ensures the safety and effectiveness of the dialysis session and helps preserve the access for future use.

Question 45: 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?

• Intravascular hemolysis (Correct answer)
• Severe hypertension
• Metabolic alkalosis
• Hypoglycemia

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

• 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 confirm the integrity of the dialyzer membrane and check for leaks
• 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 47: What is the best response if a patient becomes unresponsive during dialysis?

• Administer glucose
• Lower BFR
• Adjust dialysate
• Check responsiveness and call for help (Correct answer)

Correct answer: Check responsiveness and call for help

If a patient becomes unresponsive during dialysis, the best response is to immediately check responsiveness and call for help. An unresponsive patient is a medical emergency requiring rapid assessment of airway, breathing, and circulation (ABCs) and activation of emergency protocols. Prompt action is crucial to identify the cause and initiate life-saving interventions.

Question 48: What is the primary function of a dialysis machine?

• To assist with breathing
• To monitor vital signs
• To filter blood and remove waste (Correct answer)
• 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 49: Chloramine exposure in dialysis can result in:

• hypernatremia
• hemolysis (Correct answer)
• pericarditis
• bleeding

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 50: When explaining the concept of 'dry weight' to a patient, which description is most accurate?

• The patient's weight before starting dialysis for the first time
• The patient's weight without any excess fluid, at which their blood pressure is normal (Correct answer)
• The weight of the dialyzer and blood lines
• The maximum weight a patient is allowed to gain between treatments

Correct answer: The patient's weight without any excess fluid, at which their blood pressure is normal

Dry weight is the target weight to be achieved at the end of a dialysis treatment. It represents the patient's estimated normal body weight without the extra fluid that accumulates due to kidney failure. At this weight, the patient should not be hypotensive or have signs of fluid overload like edema or shortness of breath.

Question 51: What is the appropriate intervention if a patient reports severe back and chest pain coinciding with a pink-tinged dialysate in the waste line?

• Check patient's blood pressure and increase UF rate
• Slow the blood pump speed and monitor for improvement
• Stop treatment immediately, do not return blood, clamp all lines, and call for emergency assistance (Correct answer)
• Give the patient analgesics and continue treatment

Correct answer: Stop treatment immediately, do not return blood, clamp all lines, and call for emergency assistance

Pink dialysate with pain indicates membrane rupture with potential blood leakage into dialysate or severe hemolysis, an emergency requiring immediate treatment termination.

Question 52: What is the primary purpose of sodium profiling during dialysis?

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

Correct answer: To stabilize blood pressure

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

Question 53: Which type of hemodialysis vascular access carries the highest risk of bloodstream infection?

• Tunneled cuffed central venous catheter (Correct answer)
• Subcutaneous port-catheter device
• Synthetic arteriovenous graft
• 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 54: The technician observes that the hardness reading after the water softener is above the acceptable limit. The technician should check the softener tank's level of:

• carbon
• chlorine
• salt (Correct answer)
• sand

Correct answer: salt

Water softeners remove hardness-causing minerals like calcium and magnesium through an ion exchange process, which requires salt (sodium chloride) to regenerate the resin beads. If the hardness reading is high, it indicates the softener is not functioning effectively, most commonly because the salt level in the brine tank is too low to properly regenerate the resin. Replenishing the salt is usually the first corrective action.

Question 55: When using a slide board to transfer a patient from the dialysis chair to a wheelchair, at what angle should the slide board be placed between the two sitting surfaces?

• 60 degrees
• 45 degrees (Correct answer)
• 90 degrees
• 30 degrees

Correct answer: 45 degrees

When using a slide board to transfer a patient from one sitting surface to another, it should be placed at a 45-degree angle between the two surfaces. This angle provides optimal leverage and stability, facilitating a smooth and safe transfer while minimizing strain on both the patient and the caregiver. It ensures the patient can slide across with minimal effort.

Question 56: Which of the following best describes the purpose of pressure testing a dialyzer during reprocessing?

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

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

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

Question 57: With uremia, as waste products build up in the blood, this can result in _____________.

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

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

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

Correct answer: Pulmonary embolism or cardiac event

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

Question 59: A dialyzer arrives at the reprocessing area and is found to have a crack in the header cap. What is the correct action?

• Reprocess the dialyzer if TCV and pressure tests are within normal limits
• Quarantine the dialyzer and notify the supervisor for assessment
• Discard the dialyzer immediately without reprocessing (Correct answer)
• 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 60: What is the primary mechanism by which a reverse osmosis (RO) system purifies dialysis water?

• Ion exchange resin that traps dissolved minerals
• Forcing water through a semi-permeable membrane under pressure, rejecting 90–99% of dissolved solutes (Correct answer)
• Activated carbon adsorption of heavy metals and ions
• 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 61: What is the purpose of conducting monthly water quality testing in a hemodialysis facility?

• To determine water billing costs
• To ensure treated water meets AAMI chemical and microbiological standards and prevent patient harm from contaminated dialysate (Correct answer)
• To verify municipal water supply compliance
• To test for heavy metals only once per year

Correct answer: To ensure treated water meets AAMI chemical and microbiological standards and prevent patient harm from contaminated dialysate

Monthly water quality testing ensures the water treatment system is functioning correctly and that dialysate water meets AAMI standards, protecting patients from chemical and microbiological contamination.

Question 62: Chloramine is particularly dangerous in dialysis water because it can cause which serious complication?

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

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

• Use shorter, more frequent treatments with lower blood flow rates initially for new patients (Correct answer)
• Increase dialysate bicarbonate to correct acidosis faster
• Use a larger surface area dialyzer for more efficient clearance
• 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 64: The use of high sodium dialysate may predispose a patient to:

• fluid overload
• thirst
• hypertension
• All of the above (Correct answer)

Correct answer: All of the above

High sodium dialysate increases the osmotic gradient, drawing fluid from the patient's cells into the bloodstream. This expanded intravascular volume leads to fluid overload and can elevate blood pressure, causing hypertension. Additionally, the increased serum sodium stimulates thirst, prompting patients to drink more, further contributing to fluid retention.

Question 65: Which parameter must be verified before connecting a patient to the hemodialysis machine?

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

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

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

Question 66: Which chemical is most commonly used as a germicide during manual dialyzer reprocessing?

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

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

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

Correct answer: determine the patient's learning needs

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

Question 68: Before initiating a patient's hemodialysis treatment, the technician must ensure there is a signed consent form. This process is known as:

• Advanced directive.
• Patient assessment.
• Implied consent.
• Informed consent. (Correct answer)

Correct answer: Informed consent.

Informed consent is a legal principle requiring that patients are given sufficient information about their treatment—including its purpose, risks, and benefits—so they can make a voluntary and informed decision.

Question 69: What is the significance of the transmembrane pressure (TMP) reading on a hemodialysis machine?

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

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

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

Question 70: During dialysis, the blood leak detector alarm activates. What does this indicate and what action should be taken?

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

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

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

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

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

Question 72: According to the 'Rule of 6s,' which set of criteria indicates that an AV fistula is mature and ready for cannulation?

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

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

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

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

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

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

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

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

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

Question 76: Hemodialysis requires a means to channel the patient's blood to the hemodialyzer & then back to the body. It's called:

• dialyzing fluid delivery system
• vascular access (Correct answer)
• infusion pump
• hemodialyzer

Correct answer: vascular access

Vascular access is the essential lifeline for hemodialysis, providing a reliable and efficient means to connect the patient's circulatory system to the dialysis machine. It allows for the continuous removal of blood, its passage through the dialyzer for waste removal and fluid balance, and its safe return to the patient. Without adequate vascular access, effective hemodialysis cannot be performed.

Question 77: 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 78: Three hours into a hemodialysis session, a patient develops painful bilateral leg cramps. Their blood pressure has decreased from 138/82 mmHg at treatment start to 108/66 mmHg. What should the technician do first?

• Decrease the ultrafiltration rate and notify the nurse (Correct answer)
• Administer IV calcium gluconate per standing order
• Terminate the treatment and transfer the patient to the emergency department
• Increase the blood flow rate to speed treatment completion

Correct answer: Decrease the ultrafiltration rate and notify the nurse

Muscle cramps accompanied by a significant blood pressure drop indicate the ultrafiltration rate is exceeding the patient's plasma refill capacity. Reducing the UF rate is the immediate first response, followed by notifying the nurse, who may also order a saline bolus.

Question 79: What does a failed pressure test during dialyzer reprocessing indicate?

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

Correct answer: A leak in the dialyzer membrane

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

Question 80: A dialysis machine is set up to use 36.1X parts dialysate. If the concentrate proportioning ratio calls for 1.00 part acid and 1.10 parts bicarbonate, how many parts of water are needed?

• 34.0 (Correct answer)
• 36.1
• 31.9
• 33.0

Correct answer: 34.0

The total dialysate proportioning ratio is given as 36.1 parts. The concentrate proportioning calls for 1.00 part acid and 1.10 parts bicarbonate. To determine the parts of water needed, subtract the concentrate parts from the total parts: 36.1 (total) - 1.00 (acid) - 1.10 (bicarbonate) = 34.0 parts of water. This calculation ensures the correct dilution for the dialysate mixture.

Question 81: The required contact time for dialyzer reprocessing in a dialysis facility using peracetic acid as the germicide is ____________.

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

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 82: A hemodialysis patient receives IV vancomycin for a catheter-related bloodstream infection. Why is post-dialysis dosing often preferred?

• Vancomycin is unstable in dialysate
• Dialysis significantly removes vancomycin, so post-dialysis dosing replaces what was cleared (Correct answer)
• It improves patient compliance
• Vancomycin increases clotting risk if given before dialysis

Correct answer: Dialysis significantly removes vancomycin, so post-dialysis dosing replaces what was cleared

Hemodialysis removes a significant portion of vancomycin, especially with high-flux membranes, so post-dialysis dosing ensures therapeutic levels are maintained.

Question 83: What is the role of the reverse osmosis (RO) unit in the dialysis water treatment system?

• 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
• To add necessary minerals and electrolytes to the purified water for dialysate preparation
• To neutralize chloramines that were not removed by the activated carbon tanks

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

• 3 days
• 7 days (Correct answer)
• 14 days
• 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 85: During the reprocessing procedure, what is the purpose of the 'reverse ultrafiltration' step?

• To force cleaning agents from the dialysate compartment to the blood compartment (Correct answer)
• To test for leaks in the membrane by applying positive pressure
• To sterilize the outside of the dialyzer casing
• 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 86: When administering medications through the dialysis circuit, the CCHT must be aware that some drugs are removed by dialysis. Which drug class is most efficiently cleared during hemodialysis?

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

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

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

Question 87: What is the function of a deionizer (DI unit) in a dialysis water treatment system?

• 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
• Kill microorganisms by exposing water to high-intensity ultraviolet light

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

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

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: 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)
• Silence the alarm and continue treatment
• Remove the patient from the circuit gently
• 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 90: What is the recommended method for assessing blood flow during hemodialysis?

• By measuring the blood flow rate
• By monitoring the dialysate return
• By observing the venous pressure
• By feeling the pulse at the access site

The most direct and recommended method for assessing blood flow during hemodialysis is by measuring the blood flow rate, which is set and displayed on the dialysis machine. This rate indicates how much blood is being processed per minute through the dialyzer. While other assessments like venous pressure or feeling a thrill are important for access patency, the machine's blood flow rate is the primary parameter for monitoring the efficiency of blood processing.

Question 91: Which of the following is most likely to increase the efficacy of hemodialysis in a dialysis patient who is very large in both stature and weight?

• Change to peritoneal dialysis.
• Increase dialyzer size. (Correct answer)
• Increase salt restriction.
• 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 92: How does single-needle dialysis differ from standard two-needle hemodialysis?

• It uses one needle for access and relies on peritoneal membranes for diffusion
• It alternates blood withdrawal and return through a single needle using a dual-lumen approach (Correct answer)
• It requires a higher blood flow rate to compensate for single access
• 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 93: During needle removal at the end of hemodialysis, a patient's AV fistula site bleeds continuously for 20 minutes despite applying pressure. What should the technician do?

• Apply a tourniquet above the elbow to stop all flow through the fistula
• Notify the nurse immediately while maintaining firm, focused pressure on the needle sites without completely occluding flow (Correct answer)
• Apply more pressure and wait an additional 20 minutes before seeking help
• Apply a hemostat (clamp) to the skin over the bleeding site

Correct answer: Notify the nurse immediately while maintaining firm, focused pressure on the needle sites without completely occluding flow

Prolonged bleeding after needle removal requires immediate notification of the nurse while maintaining appropriate pressure. The key is to apply firm pressure to the needle sites specifically without completely occluding the fistula (which can cause thrombosis). A tourniquet would risk fistula thrombosis.

Question 94: When setting up the extracorporeal circuit, why is it important to prime the blood lines with saline before connecting to the patient?

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

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

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

Question 95: A patient receiving hemodialysis has a heparin allergy. Which alternative anticoagulation method is most commonly used?

• Warfarin infusion
• Citrate anticoagulation (Correct answer)
• Clopidogrel
• Aspirin infusion

Correct answer: Citrate anticoagulation

Citrate anticoagulation is the preferred alternative to heparin for patients with heparin-induced thrombocytopenia (HIT) or heparin allergy.

Question 96: Which of the following is a genetic (inherited) disease that can lead to kidney failure?

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

Correct answer: Polycystic kidney disease

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

Question 97: While preparing a patient with a tunneled hemodialysis catheter for treatment, the technician observes redness, swelling, and purulent drainage at the catheter exit site. Which additional finding is most critical to report to the nurse immediately?

• The catheter dressing was last changed four days ago
• Patient reports not eating breakfast before the session
• Patient's oral temperature of 38.4°C (101.2°F) (Correct answer)
• Catheter blood flow rate reading below 350 mL/min

Correct answer: Patient's oral temperature of 38.4°C (101.2°F)

Exit-site infection with a concurrent fever above 38°C strongly suggests the infection may have entered the bloodstream, causing bacteremia or sepsis. This combination requires urgent nursing and physician notification, possible blood cultures, and evaluation before treatment proceeds.

Question 98: A patient asks why they need to limit potassium intake. What is the primary danger of hyperkalemia in dialysis patients?

• Anemia
• Cardiac arrhythmias (Correct answer)
• Bone disease
• Infections

Correct answer: Cardiac arrhythmias

Hyperkalemia (high potassium) can cause life-threatening cardiac arrhythmias, including ventricular fibrillation, in dialysis patients.

Question 99: What does the UF goal represent and how is it determined for each treatment?

• The volume of saline to be administered during treatment
• 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)
• The dialyzer clearance capacity for urea

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

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

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

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

Question 101: Which intervention is correct when a clot is detected in the extracorporeal circuit?

• Stop blood pump and notify nurse (Correct answer)
• Continue treatment
• Flush with heparin
• Switch to saline rinse

Correct answer: Stop blood pump and notify nurse

When a clot is detected in the extracorporeal circuit, the correct intervention is to stop the blood pump and notify the nurse immediately. A clot can obstruct blood flow, damage the dialyzer, or potentially lead to an air embolism if it dislodges. Stopping the pump prevents further complications and allows for prompt assessment and management by qualified personnel.

Question 102: What is the primary purpose of the softener in the dialysis water treatment system?

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

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

• 80% of the original TCV (Correct answer)
• 70% of the original TCV
• 90% of the original TCV
• 95% 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 104: What is the purpose of disinfecting the dialysis unit between patients?

• To prevent cross-contamination (Correct answer)
• To speed up treatment times
• To reduce operating costs
• To improve the unit's appearance

Correct answer: To prevent cross-contamination

Disinfecting the dialysis unit between patients is essential to prevent cross-contamination, which is the transfer of infectious agents from one patient to another or from the environment to a patient. This practice creates a clean and safe environment, minimizing the risk of healthcare-associated infections for vulnerable dialysis patients who are often immunocompromised.

Question 105: What factors should be considered when establishing a patient's dry weight?

• Blood pressure
• Patient well being
• Evidence of dehydration or fluid overload
• All of the above (Correct answer)

Correct answer: All of the above

Establishing a patient's dry weight is a critical aspect of hemodialysis, aiming to remove excess fluid without causing dehydration. This process requires a holistic assessment, including monitoring blood pressure for signs of hypotension or hypertension, evaluating the patient's overall well-being and symptoms, and checking for clinical evidence of fluid overload or dehydration. Considering all these factors ensures the patient reaches their optimal fluid balance, preventing complications and improving their quality of life.

Question 106: What is a key consideration when positioning a dialysis patient?

• Position patient away from the machine
• Recline fully during the first hour
• Make sure patient is seated upright with access visible (Correct answer)
• Elevate legs above heart at all times

Correct answer: Make sure patient is seated upright with access visible

When positioning a dialysis patient, it is essential to ensure they are seated upright with their access visible for several reasons. This position promotes comfort, allows for easy monitoring of the access site for complications like bleeding or infiltration, and facilitates efficient treatment delivery. Proper positioning also helps prevent discomfort and potential injury during the long treatment session.

Question 107: A family member asks how they can support their loved one on dialysis. What is the most beneficial form of support to encourage?

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

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

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

Question 108: A dialysis patient develops aluminum toxicity. Which water treatment failure is the most likely cause?

• Failure of the water softener to remove calcium
• 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)

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 109: Under CMS Conditions for Coverage, what is required regarding informed consent for hemodialysis treatment?

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

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 110: 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?

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

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 111: 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)
• Fiber
• Iron
• 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 112: Which members of the dialysis center team are responsible for carrying out the quality assessment and performance improvement program at a dialysis center?

• Nurses
• All staff (Correct answer)
• Nephrologist
• Technicians

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 113: The following are factors in poor clearance during dialysis except:

• access recirculation
• poor dialyzer reuse
• low hematocrit (Correct answer)
• low blood flow rate

Correct answer: low hematocrit

Poor clearance during dialysis refers to the ineffective removal of waste products. Factors like poor dialyzer reuse (reduced efficiency), access recirculation (dialyzed blood re-entering the access), and low blood flow rate (less blood exposed to the dialyzer) directly impair the dialysis process. Low hematocrit, while indicating anemia, does not directly affect the dialyzer's ability to clear solutes from the plasma portion of the blood.

Question 114: 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 Occupational Safety and Health Administration (OSHA)
• The Food and Drug Administration (FDA)

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 115: What is the function of heparin in dialysis?

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

Correct answer: Prevent clotting

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

Question 116: What is the first step in performing a patient assessment during hemodialysis?

• Assess the access site
• Initiate dialysis treatment
• Check vital signs and overall condition (Correct answer)
• Check blood pressure

Correct answer: Check vital signs and overall condition

The first step in any patient assessment, including during hemodialysis, is to establish a baseline of the patient's current physiological state. Checking vital signs (temperature, pulse, respiration, blood pressure) and observing their overall condition provides crucial information about their stability and readiness for treatment. This initial assessment helps identify any immediate concerns before proceeding with more specific checks.

Question 117: The technician's permitted responsibilities mostly depend on the ______.

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

Correct answer: state regulations/standards of practice.

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

Question 118: Which component of the dialysis machine is responsible for controlling the flow of blood through the dialyzer?

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

Correct answer: Blood pump

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

Question 119: In chronic kidney disease, what is the typical relationship between serum calcium and serum phosphorus levels before treatment?

• Calcium is low, and phosphorus is high. (Correct answer)
• Calcium is high, and phosphorus is low.
• Both are typically high.
• Both are typically low.

Correct answer: Calcium is low, and phosphorus is high.

Failing kidneys are unable to excrete phosphorus effectively, leading to high serum phosphorus (hyperphosphatemia). The high phosphorus levels and lack of activated Vitamin D lead to low serum calcium (hypocalcemia).

Question 120: A new female patient is admitted to the dialysis center in the company of a male who appears to be her spouse. If the patient's chart lists her name as Mary Jo Johnson, how should the patient be addressed?

• Mrs. Johnson
• Mary Jo
• Ms. Johnson
• Ask the patient (Correct answer)

Correct answer: Ask the patient

It is always best practice to ask a patient how they prefer to be addressed, regardless of their marital status or the name on their chart. This demonstrates respect for their autonomy and personal preferences, fostering a more comfortable and patient-centered care environment. Assuming a title or name can be disrespectful or incorrect.

Question 121: When using an alcohol-based hand rub, the hand rub should be applied to one palm and the hands rubbed together _____________.

• for 15 seconds
• until dry (Correct answer)
• for 30 seconds
• for 5 seconds

Correct answer: until dry

When using alcohol-based hand rubs, it is crucial to rub the hands together thoroughly until they are completely dry. This ensures that the alcohol has sufficient contact time to effectively kill microorganisms on the skin surface. Allowing the hands to air dry completely also prevents the transfer of wet product to surfaces or patients, maintaining hygiene standards.

Question 122: If a patient’s access site begins bleeding excessively during dialysis, what should be done first?

• Call 911
• Increase heparin dose
• Apply pressure to the site (Correct answer)
• Adjust the dialysate

Correct answer: Apply pressure to the site

If a patient’s access site begins bleeding excessively during dialysis, the first and most critical action is to apply direct pressure to the site. This immediate intervention helps to control the bleeding and prevent significant blood loss. After applying pressure, the nurse or physician should be notified for further assessment and management.

Question 123: Which of the following is an important step before starting dialysis?

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

Correct answer: All of the above

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

Question 124: What is the minimum time a newly placed tunneled hemodialysis catheter should be used after insertion before the catheter tract is considered mature enough for routine use?

• 24–48 hours; during this period the catheter should be handled gently and the insertion site monitored
• Catheters can be used immediately after placement and confirmation by chest X-ray (Correct answer)
• 1 month; the patient should use a temporary catheter until the tunneled catheter matures
• 1 week; the catheter must not be used for 7 days to allow the cuff to become adherent

Correct answer: Catheters can be used immediately after placement and confirmation by chest X-ray

Tunneled hemodialysis catheters (e.g., Tesio, Palindrome, Mahurkar) can be used immediately after placement once position is confirmed by chest X-ray to exclude pneumothorax and verify tip position in the right atrium/superior vena cava junction. Immediate use is standard of care.

Question 125: What should you do if there is a blood leak detected during dialysis?

• Switch to a new dialyzer
• Increase blood flow
• Stop dialysis and check for leaks (Correct answer)
• Continue dialysis and monitor the patient

Correct answer: Stop dialysis and check for leaks

If a blood leak is detected during dialysis, it indicates a breach in the integrity of the extracorporeal circuit, which can lead to blood loss, contamination, or exposure to dialysate. The immediate and correct action is to stop dialysis to prevent further complications and thoroughly investigate the source of the leak. Continuing treatment or increasing blood flow would be dangerous and could exacerbate the problem.

Question 126: A patient beginning hemodialysis usually has a hemoglobin test every _____________.

• one to two months
• one to two weeks (Correct answer)
• four weeks
• treatment

Correct answer: one to two weeks

Hemoglobin levels are crucial for monitoring anemia, a common complication in hemodialysis patients. For patients newly starting hemodialysis, or those with unstable hemoglobin levels, testing is typically done every one to two weeks. This frequent monitoring allows the healthcare team to promptly adjust anemia management strategies, such as erythropoietin-stimulating agents or iron supplements, to maintain target hemoglobin levels.

Question 127: 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?

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

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

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

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

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

Question 129: 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
• Inadequate heparin dosing
• Clotting in the venous needle or access (Correct answer)

Correct answer: Clotting in the venous needle or access

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

Question 130: What should you do if the dialysis machine alarms due to a low blood flow?

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

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 131: Diffusion is a process that involves _____________.

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

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

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

Question 132: A patient begins to experience shortness of breath, itching, and hives within the first 15 minutes of treatment. The technician should suspect which complication?

• Air embolism
• Anaphylactic reaction (Correct answer)
• Disequilibrium syndrome
• Hemolysis

Correct answer: Anaphylactic reaction

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

Question 133: What type of water quality testing documents are required to be maintained in the dialysis facility?

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

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

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

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

• 0.2 ppm. (Correct answer)
• 0.4 ppm.
• 2.0 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 136: What is the primary role of carbon tanks in the dialysis water treatment system?

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

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 137: For hemodialysis, a patient has a right internal jugular central venous catheter; nevertheless, during treatment, a pressure alert rings, signaling that the blood flow rate is lower than recommended. The technician examines the lines and discovers that they seem clear and that there are no indications of kinking, bleeding, or air entering the system. The following action should be taken to _______.

• flush the central venous catheter with normal saline.
• reverse the arterial and venous lines.
• lower the patient’s head and ask the patient to cough. (Correct answer)
• stop dialysis.

Correct answer: lower the patient’s head and ask the patient to cough.

The next step should be to lower the patient's head and ask them to cough if a pressure alarm during hemodialysis on a patient with a right internal jugular central venous catheter indicates that the blood flow rate is lower than prescribed but the technician finds that the lines are clear and there are no signs of kinking, bleeding, or air entering the system. In order to improve blood flow, this may aid in moving the catheter's tip.

Question 138: How many consecutive cannulations are typically necessary to form a buttonhole tract before it is sufficiently formed?

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

Correct answer: 8 to 10.

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

Question 139: Which route of administration is preferred for erythropoiesis-stimulating agents (ESAs) in hemodialysis patients?

• Oral
• Intravenous or subcutaneous (Correct answer)
• Intramuscular
• Transdermal

Correct answer: Intravenous or subcutaneous

ESAs are most commonly given IV (directly into the dialysis circuit) or subcutaneously; IV is convenient during dialysis sessions.

Question 140: When administering erythropoiesis-stimulating agents (ESAs) to a dialysis patient, what is the primary goal?

• Lower serum phosphorus
• Reduce blood pressure
• Treat anemia of chronic kidney disease (Correct answer)
• Prevent infection

Correct answer: Treat anemia of chronic kidney disease

ESAs such as epoetin alfa stimulate red blood cell production to treat the anemia associated with chronic kidney disease in dialysis patients.

Question 141: A female technician has been caring for a male patient for several months. The patient tells the technician that he is lonely and depressed. He asks the technician to go out to dinner with him. In addition to politely declining the patient's invitation, which of these actions, if any, should be taken:

• Refer the patient to the social worker (Correct answer)
• Share the patient's need for socialization with other patients
• No further action is needed
• Recommend an over-the-counter mood stimulant, such as St. John's wort

Correct answer: Refer the patient to the social worker

Maintaining professional boundaries is crucial in healthcare. While politely declining the invitation is necessary, the patient's expression of loneliness and depression indicates a need for psychosocial support. Referring the patient to the social worker is the appropriate action, as social workers are trained to address emotional well-being, provide counseling, and connect patients with appropriate resources to manage their mental health.

Question 142: Which electrolyte imbalance is most likely to cause a dialysis patient to experience tetany (involuntary muscle contractions)?

• Hyperkalemia
• Hypermagnesemia
• Hypernatremia
• Hypocalcemia (Correct answer)

Correct answer: Hypocalcemia

Hypocalcemia causes increased neuromuscular excitability, leading to tetany, muscle spasms, and potentially seizures.

Question 143: You test for sterilant levels in a hemodialysis machine prior to patient use. The test is positive for sterilant. This means the machine:

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

Correct answer: needs further rinsing

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

Question 144: At minimum, how frequently should dialysis water be tested for bacteriological contamination according to AAMI guidelines?

• Quarterly
• Monthly (Correct answer)
• Weekly
• Daily

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

• nurse.
• nephrologist.
• supervisor.
• 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 146: 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 147: The capability of a dialyzer to remove fluid, expressed as ml/mmHg/hr is:

• clearance
• priming volume
• surface area
• UF Coefficient (Correct answer)

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

• Patient name or ID, reuse count, and date of last reprocessing (Correct answer)
• Physician name, germicide concentration, and date of first use
• Nurse's initials, reuse count, and TCV percentage
• 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 149: Midway through a patient's dialysis session, the technician notes that the patient's temperature has risen from 36.7°C (98.1°F) at baseline to 38.1°C (100.6°F). What is the most appropriate next action?

• Administer acetaminophen and document without escalating to nursing staff
• Notify the nurse immediately and assess the access site and catheter for signs of infection (Correct answer)
• Increase the dialysate temperature to match the patient's current body temperature
• Continue treatment and recheck temperature in 30 minutes without intervention

Correct answer: Notify the nurse immediately and assess the access site and catheter for signs of infection

A rising fever during hemodialysis may indicate bacteremia, particularly from an infected access site or catheter. The technician must notify the nurse promptly so blood cultures can be obtained and the patient evaluated for systemic infection before continuing treatment.

Question 150: What is the purpose of testing dialysis water for endotoxins?

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

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.