Dialysis Technology Certification Exam] – Questions And
Answers | Verified And Well Detailed Answers Plus Rationales
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1. A patient undergoing a routine hemodialysis treatment begins to complain of sudden
cramping in the calves and feet. Which of the following is the most appropriate immediate
nursing or technician intervention?
A. Administer a bolus of 500 mL of normal saline immediately
B. Reduce the blood pump speed and assess the ultrafiltration rate
C. Stop the dialysis treatment permanently and disconnect the patient
D. Increase the dialysate temperature to improve peripheral circulation
Rationale: Muscle cramps during hemodialysis are frequently related to rapid fluid removal or
reaching below the target dry weight. Reducing the ultrafiltration rate or blood pump speed
helps manage symptoms, while administering a smaller, specific bolus of normal saline (typically
100 to 200 mL as ordered) may be used rather than a large 500 mL bolus without physician
protocol.
2. During the setup of a single-patient hemodialysis machine, the technician performs a
residual chlorine check using an AAMI-approved test strip. The test yields a positive result
for residual chlorine. What is the immediate and correct course of action?
A. Proceed with priming the bloodlines since the machine will self-sanitize
B. Document the result and begin the patient treatment as scheduled
C. Retest the water; if positive, do not initiate treatment and notify the biomedical department
immediately
D. Flush the water system with hot water for five minutes and retest once
Rationale: Residual chlorine (chloramines) in the water supply is extremely toxic to red blood
cells, causing acute hemolysis. A positive test means the carbon tanks have failed or are
exhausted. Treatment must not start until water safety is verified.
3. A patient with end-stage renal disease (ESRD) has an arteriovenous (AV) fistula in the
left arm. Which of the following assessments must be performed prior to cannulation?
A. Measure the blood pressure in the left arm using an automated cuff
B. Palpate for a thrill and auscultate for a bruit over the access site
C. Apply a tight tourniquet above the elbow to engorge the veins fully
D. Check for capillary refill time in the fingers of the right hand
Rationale: Verifying the patency of an AV fistula requires feeling a physical thrill (vibration) and
listening for a bruit (swooshing sound). Blood pressure measurements and tourniquets should
generally be avoided on an access arm to prevent trauma and thrombosis.
,4. When priming an extracorporeal circuit for a pediatric patient, normal saline is typically
used with an additive. What medication is commonly added to the priming solution to
prevent clotting in small-volume circuits?
A. Epinephrine
B. Heparin
C. Protamine sulfate
D. Erythropoietin
Rationale: Heparin is routinely added to the priming saline in pediatric or low-volume circuits to
prevent clotting of the bloodlines and dialyzer during the initiation of treatment, adhering to
facility protocols.
5. Which of the following water treatment components is primarily responsible for the
removal of dissolved ionic contaminants and heavy metals?
A. Depth filter
B. Water softener
C. Reverse osmosis (RO) membrane
D. Carbon adsorption tank
Rationale: The reverse osmosis membrane acts as a semi-permeable barrier that rejects up to 95
to 99 percent of dissolved ionic impurities, organics, bacteria, and pyrogens from the water
supply.
6. A patient on hemodialysis exhibits a venous pressure that is steadily rising while the
arterial pressure remains stable. What is the most likely cause of this pressure change?
A. Kinking of the arterial bloodline upstream from the blood pump
B. Clotting within the venous drip chamber or needle
C. Infiltration of the arterial access needle
D. A significant drop in the systemic blood pressure of the patient
Rationale: An increasing venous pressure while arterial pressure is stable usually indicates an
obstruction or resistance downstream from the pressure monitor, such as clotting in the venous
line, a partially occluded venous needle, or infiltration at the venous site.
7. In accordance with infection control standards, how often must hemodialysis station
surfaces be disinfected between patient treatments?
A. Only at the end of the operating shift
B. Once a day before the morning shift begins
C. After every patient treatment using an EPA-registered disinfectant
D. Whenever visible blood or fluid stains are present
Rationale: Standard precautions require that all touchable surfaces, machine exteriors, chairs,
and equipment at the dialysis station be thoroughly cleaned and disinfected with an EPA-
registered germicide between every patient treatment to prevent cross-contamination.
,8. A dialysis technician notes that a patient's pre-dialysis weight is 3.5 kg above their
established dry weight. The prescribed fluid removal goal for the session is 2.0 kg, and the
total prime and rinseback fluid volume is 0.8 kg. What is the total fluid to be removed
during the treatment?
A. 2.0 kg
B. 2.8 kg
C. 3.5 kg
D. 4.3 kg
Rationale: The total fluid removal calculation includes the prescribed ultrafiltration goal plus
the fluid added from the machine prime and saline rinseback (2.0 kg + 0.8 kg = 2.8 kg). The pre-
dialysis weight compared to dry weight guides overall fluid management, but the specific
removal target for the run accounts for internal circuit volumes.
9. Which of the following laboratory values is most indicative of adequate dialysis
adequacy (Kt/V) over time?
A. Serum creatinine
B. Blood urea nitrogen (BUN) reduction ratio and Kt/V
C. Serum potassium levels
D. Total iron-binding capacity
Rationale: Kt/V and the urea reduction ratio (URR) are standard mathematical measurements
used to quantify the adequacy of the dialysis dose delivered, comparing pre- and post-treatment
blood urea nitrogen levels.
10. What is the primary purpose of a water softener in a dialysis water treatment system?
A. To remove chlorine and chloramines from the municipal supply
B. To remove calcium and magnesium ions that cause water hardness
C. To eliminate bacteria, endotoxins, and microbial fragments
D. To adjust the final pH of the water before it enters the reverse osmosis unit
Rationale: Water softeners use an ion-exchange process to remove scale-forming calcium and
magnesium ions, protecting downstream equipment like the reverse osmosis membrane from
scaling and premature failure.
11. A patient complains of feeling dizzy, lightheaded, and nauseated 30 minutes before the
end of a 4-hour hemodialysis treatment. Blood pressure measurement shows a drop from
140/80 mmHg to 90/50 mmHg. What is this acute complication called?
A. Dialysis disequilibrium syndrome
B. First-use syndrome
C. Hypotensive episode
D. Hemolytic reaction
, Rationale: Intradialytic hypotension is one of the most common acute complications during
hemodialysis, often caused by rapid fluid removal exceeding vascular refill rate, excessive
ultrafiltration, or autonomic dysfunction.
12. When evaluating a newly created arteriovenous graft (AVG), the technician
understands that grafts typically utilize which type of material?
A. Autologous native saphenous vein
B. Synthetic polytetrafluoroethylene (PTFE)
C. Bovine internal jugular vein
D. Porcine umbilical cord tissue
Rationale: Arteriovenous grafts are surgically created using synthetic materials, most commonly
expanded polytetrafluoroethylene (PTFE), bridging an artery and a vein when a native fistula is
not feasible.
13. Which of the following needle gauges corresponds to the largest internal lumen
diameter commonly used for routine adult hemodialysis access cannulation?
A. 17 gauge
B. 16 gauge
C. 15 gauge
D. 14 gauge
Rationale: In needle gauge sizing, a smaller number indicates a larger inner diameter. A 14-
gauge needle is larger than a 15, 16, or 17-gauge needle, allowing for higher blood flow rates
with lower resistance.
14. During dialyzer setup, the technician performs priming. Why is it mandatory to
completely remove all air from the blood compartment of the dialyzer and bloodlines prior
to connecting the patient?
A. To prevent the occurrence of an air embolism
B. To increase the clearance of middle molecules
C. To activate the dialyzer membrane effectively
D. To prevent transmembrane pressure from dropping to zero
Rationale: Air trapped in the extracorporeal circuit can enter the patient's vascular system,
leading to a catastrophic air embolism. Priming thoroughly with saline under proper venous
pressure eliminates all air pockets.
15. What is the primary clinical indicator that mandates prompt intervention for a patient
experiencing hemolysis during hemodialysis?
A. Bright red or cherry-colored blood in the venous drip chamber
B. Dark, opaque blood returning through the venous line
C. A sudden increase in dialysate temperature
D. A marked drop in transmembrane pressure
Answers | Verified And Well Detailed Answers Plus Rationales
| Guaranteed Pass | Latest Exam Update | Exam Prep | Study
Guide | Practice Test| Download Instant Pdf
1. A patient undergoing a routine hemodialysis treatment begins to complain of sudden
cramping in the calves and feet. Which of the following is the most appropriate immediate
nursing or technician intervention?
A. Administer a bolus of 500 mL of normal saline immediately
B. Reduce the blood pump speed and assess the ultrafiltration rate
C. Stop the dialysis treatment permanently and disconnect the patient
D. Increase the dialysate temperature to improve peripheral circulation
Rationale: Muscle cramps during hemodialysis are frequently related to rapid fluid removal or
reaching below the target dry weight. Reducing the ultrafiltration rate or blood pump speed
helps manage symptoms, while administering a smaller, specific bolus of normal saline (typically
100 to 200 mL as ordered) may be used rather than a large 500 mL bolus without physician
protocol.
2. During the setup of a single-patient hemodialysis machine, the technician performs a
residual chlorine check using an AAMI-approved test strip. The test yields a positive result
for residual chlorine. What is the immediate and correct course of action?
A. Proceed with priming the bloodlines since the machine will self-sanitize
B. Document the result and begin the patient treatment as scheduled
C. Retest the water; if positive, do not initiate treatment and notify the biomedical department
immediately
D. Flush the water system with hot water for five minutes and retest once
Rationale: Residual chlorine (chloramines) in the water supply is extremely toxic to red blood
cells, causing acute hemolysis. A positive test means the carbon tanks have failed or are
exhausted. Treatment must not start until water safety is verified.
3. A patient with end-stage renal disease (ESRD) has an arteriovenous (AV) fistula in the
left arm. Which of the following assessments must be performed prior to cannulation?
A. Measure the blood pressure in the left arm using an automated cuff
B. Palpate for a thrill and auscultate for a bruit over the access site
C. Apply a tight tourniquet above the elbow to engorge the veins fully
D. Check for capillary refill time in the fingers of the right hand
Rationale: Verifying the patency of an AV fistula requires feeling a physical thrill (vibration) and
listening for a bruit (swooshing sound). Blood pressure measurements and tourniquets should
generally be avoided on an access arm to prevent trauma and thrombosis.
,4. When priming an extracorporeal circuit for a pediatric patient, normal saline is typically
used with an additive. What medication is commonly added to the priming solution to
prevent clotting in small-volume circuits?
A. Epinephrine
B. Heparin
C. Protamine sulfate
D. Erythropoietin
Rationale: Heparin is routinely added to the priming saline in pediatric or low-volume circuits to
prevent clotting of the bloodlines and dialyzer during the initiation of treatment, adhering to
facility protocols.
5. Which of the following water treatment components is primarily responsible for the
removal of dissolved ionic contaminants and heavy metals?
A. Depth filter
B. Water softener
C. Reverse osmosis (RO) membrane
D. Carbon adsorption tank
Rationale: The reverse osmosis membrane acts as a semi-permeable barrier that rejects up to 95
to 99 percent of dissolved ionic impurities, organics, bacteria, and pyrogens from the water
supply.
6. A patient on hemodialysis exhibits a venous pressure that is steadily rising while the
arterial pressure remains stable. What is the most likely cause of this pressure change?
A. Kinking of the arterial bloodline upstream from the blood pump
B. Clotting within the venous drip chamber or needle
C. Infiltration of the arterial access needle
D. A significant drop in the systemic blood pressure of the patient
Rationale: An increasing venous pressure while arterial pressure is stable usually indicates an
obstruction or resistance downstream from the pressure monitor, such as clotting in the venous
line, a partially occluded venous needle, or infiltration at the venous site.
7. In accordance with infection control standards, how often must hemodialysis station
surfaces be disinfected between patient treatments?
A. Only at the end of the operating shift
B. Once a day before the morning shift begins
C. After every patient treatment using an EPA-registered disinfectant
D. Whenever visible blood or fluid stains are present
Rationale: Standard precautions require that all touchable surfaces, machine exteriors, chairs,
and equipment at the dialysis station be thoroughly cleaned and disinfected with an EPA-
registered germicide between every patient treatment to prevent cross-contamination.
,8. A dialysis technician notes that a patient's pre-dialysis weight is 3.5 kg above their
established dry weight. The prescribed fluid removal goal for the session is 2.0 kg, and the
total prime and rinseback fluid volume is 0.8 kg. What is the total fluid to be removed
during the treatment?
A. 2.0 kg
B. 2.8 kg
C. 3.5 kg
D. 4.3 kg
Rationale: The total fluid removal calculation includes the prescribed ultrafiltration goal plus
the fluid added from the machine prime and saline rinseback (2.0 kg + 0.8 kg = 2.8 kg). The pre-
dialysis weight compared to dry weight guides overall fluid management, but the specific
removal target for the run accounts for internal circuit volumes.
9. Which of the following laboratory values is most indicative of adequate dialysis
adequacy (Kt/V) over time?
A. Serum creatinine
B. Blood urea nitrogen (BUN) reduction ratio and Kt/V
C. Serum potassium levels
D. Total iron-binding capacity
Rationale: Kt/V and the urea reduction ratio (URR) are standard mathematical measurements
used to quantify the adequacy of the dialysis dose delivered, comparing pre- and post-treatment
blood urea nitrogen levels.
10. What is the primary purpose of a water softener in a dialysis water treatment system?
A. To remove chlorine and chloramines from the municipal supply
B. To remove calcium and magnesium ions that cause water hardness
C. To eliminate bacteria, endotoxins, and microbial fragments
D. To adjust the final pH of the water before it enters the reverse osmosis unit
Rationale: Water softeners use an ion-exchange process to remove scale-forming calcium and
magnesium ions, protecting downstream equipment like the reverse osmosis membrane from
scaling and premature failure.
11. A patient complains of feeling dizzy, lightheaded, and nauseated 30 minutes before the
end of a 4-hour hemodialysis treatment. Blood pressure measurement shows a drop from
140/80 mmHg to 90/50 mmHg. What is this acute complication called?
A. Dialysis disequilibrium syndrome
B. First-use syndrome
C. Hypotensive episode
D. Hemolytic reaction
, Rationale: Intradialytic hypotension is one of the most common acute complications during
hemodialysis, often caused by rapid fluid removal exceeding vascular refill rate, excessive
ultrafiltration, or autonomic dysfunction.
12. When evaluating a newly created arteriovenous graft (AVG), the technician
understands that grafts typically utilize which type of material?
A. Autologous native saphenous vein
B. Synthetic polytetrafluoroethylene (PTFE)
C. Bovine internal jugular vein
D. Porcine umbilical cord tissue
Rationale: Arteriovenous grafts are surgically created using synthetic materials, most commonly
expanded polytetrafluoroethylene (PTFE), bridging an artery and a vein when a native fistula is
not feasible.
13. Which of the following needle gauges corresponds to the largest internal lumen
diameter commonly used for routine adult hemodialysis access cannulation?
A. 17 gauge
B. 16 gauge
C. 15 gauge
D. 14 gauge
Rationale: In needle gauge sizing, a smaller number indicates a larger inner diameter. A 14-
gauge needle is larger than a 15, 16, or 17-gauge needle, allowing for higher blood flow rates
with lower resistance.
14. During dialyzer setup, the technician performs priming. Why is it mandatory to
completely remove all air from the blood compartment of the dialyzer and bloodlines prior
to connecting the patient?
A. To prevent the occurrence of an air embolism
B. To increase the clearance of middle molecules
C. To activate the dialyzer membrane effectively
D. To prevent transmembrane pressure from dropping to zero
Rationale: Air trapped in the extracorporeal circuit can enter the patient's vascular system,
leading to a catastrophic air embolism. Priming thoroughly with saline under proper venous
pressure eliminates all air pockets.
15. What is the primary clinical indicator that mandates prompt intervention for a patient
experiencing hemolysis during hemodialysis?
A. Bright red or cherry-colored blood in the venous drip chamber
B. Dark, opaque blood returning through the venous line
C. A sudden increase in dialysate temperature
D. A marked drop in transmembrane pressure
