Certified Dialysis Nurse (CDN®) | NNCC CDN®
Certification Exam Study Guide & Prep 2026/2027
| Certified Dialysis Nurse Review, Nephrology
Nursing, Kidney Disease, Hemodialysis, Peritoneal
Dialysis, Dialysis Complications, Vascular Access,
Fluid & Electrolyte Management, Dialysis
Medications, Infection Control, Patient Education,
Transplant & Acute Therapies, Clinical Practice,
Practice Questions, Answers & Detailed Rationales
Question 1: A patient on hemodialysis presents with a sudden onset of
respiratory distress, hypotension, and back pain during the first 15 minutes of
treatment. What is the most likely cause of these symptoms?
A. Air embolism
B. Hemolysis
C. Dialyzer reaction (first-use syndrome)
D. Hyperkalemia
CORRECT ANSWER: C. Dialyzer reaction (first-use syndrome)
Rationale: A first-use syndrome, also known as a type A dialyzer reaction, is an
anaphylactoid reaction typically occurring within the first 15-20 minutes of a
hemodialysis session. It is characterized by respiratory distress, hypotension, and back
or chest pain. Air embolism typically presents with coughing, dyspnea, and cyanosis,
while hemolysis presents with "grossly bloody" or "coca-cola" colored venous line blood.
Hyperkalemia does not present acutely with these specific symptoms during the first
minutes of dialysis.
Question 2: Which of the following vascular access devices has the lowest rate
of infection and thrombosis, making it the preferred choice for long-term
hemodialysis?
A. Central venous catheter (CVC)
B. Arteriovenous graft (AVG)
C. Arteriovenous fistula (AVF)
D. Peritoneal dialysis catheter
CORRECT ANSWER: C. Arteriovenous fistula (AVF)
Rationale: The AVF is the gold standard for vascular access due to its superior patency
rates and significantly lower incidence of infection and thrombosis compared to AVGs
and CVCs. The AVF is created using the patient's own native vessels, which reduces the
foreign body reaction and subsequent complications.
Question 3: A diabetic patient on hemodialysis is experiencing delayed gastric
emptying. Which medication is most commonly prescribed to manage this
complication?
,A. Sucralfate
B. Metoclopramide
C. Omeprazole
D. Loperamide
CORRECT ANSWER: B. Metoclopramide
Rationale: Metoclopramide is a prokinetic agent that enhances gastric motility and is
commonly used to treat gastroparesis (delayed gastric emptying), a frequent
complication in diabetic dialysis patients. Sucralfate is a mucosal protectant for ulcers,
Omeprazole reduces gastric acid, and Loperamide is an antidiarrheal agent.
Question 4: In the context of hemodialysis, what does the term "ultrafiltration
rate" (UFR) specifically refer to?
A. The rate of blood flow through the dialyzer
B. The volume of fluid removed from the patient per hour
C. The rate at which dialysate flows through the machine
D. The concentration of heparin infused per hour
CORRECT ANSWER: B. The volume of fluid removed from the patient per hour
Rationale: UFR is the speed at which fluid is removed from the patient during dialysis,
measured in mL/kg/hr. It is a critical parameter for hemodynamic stability. Blood flow
rate (BFR) refers to the blood pump speed, dialysate flow rate is the speed of the
dialysate, and heparin is the anticoagulant dose.
Question 5: Which of the following is an early sign of hypoxemia during
hemodialysis that the nurse should monitor for?
A. Bradycardia
B. Restlessness and confusion
C. Flushed skin
D. Hypertension
CORRECT ANSWER: B. Restlessness and confusion
Rationale: Restlessness and confusion are early neurological signs of hypoxia due to the
brain's high sensitivity to oxygen deprivation. While tachycardia (not bradycardia), pallor
(not flushing), and hypotension (not hypertension) are also signs, restlessness and
confusion are key early indicators.
Question 6: The dialysate solution used in conventional hemodialysis typically
contains which of the following electrolytes at a concentration similar to that
of normal plasma?
A. Potassium and Calcium
B. Sodium and Bicarbonate
C. Chloride and Magnesium
D. Sodium and Potassium
,CORRECT ANSWER: B. Sodium and Bicarbonate
Rationale: The sodium concentration in dialysate is usually close to physiological plasma
levels (around 135-145 mEq/L) to prevent rapid shifts. Bicarbonate is used as the
primary buffer to correct metabolic acidosis, and its concentration is also maintained
near physiological levels to maintain acid-base balance.
Question 7: A patient undergoing peritoneal dialysis reports severe abdominal
pain and the effluent returns cloudy. What is the most probable diagnosis?
A. Constipation
B. Peritonitis
C. Catheter migration
D. Hernia
CORRECT ANSWER: B. Peritonitis
Rationale: Cloudy peritoneal effluent is the hallmark sign of peritonitis, an infection of
the peritoneal cavity. This is the most common and serious complication of peritoneal
dialysis. While the other options can cause abdominal pain, they do not typically present
with cloudy effluent.
Question 8: Which of the following medications is the primary anticoagulant
used during hemodialysis to prevent clotting in the extracorporeal circuit?
A. Aspirin
B. Warfarin
C. Heparin
D. Enoxaparin
CORRECT ANSWER: C. Heparin
Rationale: Unfractionated Heparin is the most commonly used anticoagulant during
hemodialysis due to its rapid onset, short half-life, and reversibility with protamine
sulfate. Aspirin and Warfarin are not typically used for this purpose, and Enoxaparin is a
low-molecular-weight heparin usually reserved for other indications.
Question 9: The primary function of a dialyzer (artificial kidney) is to facilitate
the movement of solutes and water across a semipermeable membrane. This
process is primarily driven by:
A. Active transport and filtration
B. Diffusion and convection
C. Osmosis and active transport
D. Ultrafiltration and phagocytosis
CORRECT ANSWER: B. Diffusion and convection
Rationale: Dialysis works through two primary principles: Diffusion (movement of
solutes from high to low concentration) and Convection (movement of solutes with
, water across a pressure gradient, also known as ultrafiltration). Active transport is not a
mechanism of the artificial membrane.
Question 10: Which nursing intervention is most critical for preventing
infection at a hemodialysis central venous catheter exit site?
A. Applying an antibiotic ointment daily
B. Changing the dressing using aseptic technique
C. Keeping the catheter clamped at all times when not in use
D. Flushing the catheter with heparin daily
CORRECT ANSWER: B. Changing the dressing using aseptic technique
Rationale: The use of strict aseptic technique during dressing changes is the single most
important intervention to prevent catheter-related bloodstream infections (CRBSIs).
Antibiotic ointments are generally not recommended due to fungal resistance, clamping
the catheter isn't directly related to infection, and heparin flushing prevents thrombosis,
not infection.
Question 11: In a patient receiving hemodialysis, a "dry weight" (target
weight) is defined as:
A. The patient's weight immediately after dialysis
B. The weight at which the patient is normotensive and free of edema
C. The ideal body weight based on the patient's height and age
D. The weight at which the patient experiences muscle cramps
CORRECT ANSWER: B. The weight at which the patient is normotensive and
free of edema
Rationale: Dry weight is the patient's weight after all excess fluid has been removed,
resulting in the absence of edema, clear lungs, and normotension. It is the target for
ultrafiltration, though it can fluctuate.
Question 12: Which of the following dietary minerals is most rigorously
restricted for patients on hemodialysis to prevent life-threatening cardiac
arrhythmias?
A. Sodium
B. Phosphorus
C. Potassium
D. Calcium
CORRECT ANSWER: C. Potassium
Rationale: Hyperkalemia (high potassium) is a potentially fatal complication of renal
failure that can cause cardiac arrhythmias and sudden death. While sodium and
phosphorus are also restricted, potassium restriction is most critical regarding acute life-
threatening cardiac risks.
Certification Exam Study Guide & Prep 2026/2027
| Certified Dialysis Nurse Review, Nephrology
Nursing, Kidney Disease, Hemodialysis, Peritoneal
Dialysis, Dialysis Complications, Vascular Access,
Fluid & Electrolyte Management, Dialysis
Medications, Infection Control, Patient Education,
Transplant & Acute Therapies, Clinical Practice,
Practice Questions, Answers & Detailed Rationales
Question 1: A patient on hemodialysis presents with a sudden onset of
respiratory distress, hypotension, and back pain during the first 15 minutes of
treatment. What is the most likely cause of these symptoms?
A. Air embolism
B. Hemolysis
C. Dialyzer reaction (first-use syndrome)
D. Hyperkalemia
CORRECT ANSWER: C. Dialyzer reaction (first-use syndrome)
Rationale: A first-use syndrome, also known as a type A dialyzer reaction, is an
anaphylactoid reaction typically occurring within the first 15-20 minutes of a
hemodialysis session. It is characterized by respiratory distress, hypotension, and back
or chest pain. Air embolism typically presents with coughing, dyspnea, and cyanosis,
while hemolysis presents with "grossly bloody" or "coca-cola" colored venous line blood.
Hyperkalemia does not present acutely with these specific symptoms during the first
minutes of dialysis.
Question 2: Which of the following vascular access devices has the lowest rate
of infection and thrombosis, making it the preferred choice for long-term
hemodialysis?
A. Central venous catheter (CVC)
B. Arteriovenous graft (AVG)
C. Arteriovenous fistula (AVF)
D. Peritoneal dialysis catheter
CORRECT ANSWER: C. Arteriovenous fistula (AVF)
Rationale: The AVF is the gold standard for vascular access due to its superior patency
rates and significantly lower incidence of infection and thrombosis compared to AVGs
and CVCs. The AVF is created using the patient's own native vessels, which reduces the
foreign body reaction and subsequent complications.
Question 3: A diabetic patient on hemodialysis is experiencing delayed gastric
emptying. Which medication is most commonly prescribed to manage this
complication?
,A. Sucralfate
B. Metoclopramide
C. Omeprazole
D. Loperamide
CORRECT ANSWER: B. Metoclopramide
Rationale: Metoclopramide is a prokinetic agent that enhances gastric motility and is
commonly used to treat gastroparesis (delayed gastric emptying), a frequent
complication in diabetic dialysis patients. Sucralfate is a mucosal protectant for ulcers,
Omeprazole reduces gastric acid, and Loperamide is an antidiarrheal agent.
Question 4: In the context of hemodialysis, what does the term "ultrafiltration
rate" (UFR) specifically refer to?
A. The rate of blood flow through the dialyzer
B. The volume of fluid removed from the patient per hour
C. The rate at which dialysate flows through the machine
D. The concentration of heparin infused per hour
CORRECT ANSWER: B. The volume of fluid removed from the patient per hour
Rationale: UFR is the speed at which fluid is removed from the patient during dialysis,
measured in mL/kg/hr. It is a critical parameter for hemodynamic stability. Blood flow
rate (BFR) refers to the blood pump speed, dialysate flow rate is the speed of the
dialysate, and heparin is the anticoagulant dose.
Question 5: Which of the following is an early sign of hypoxemia during
hemodialysis that the nurse should monitor for?
A. Bradycardia
B. Restlessness and confusion
C. Flushed skin
D. Hypertension
CORRECT ANSWER: B. Restlessness and confusion
Rationale: Restlessness and confusion are early neurological signs of hypoxia due to the
brain's high sensitivity to oxygen deprivation. While tachycardia (not bradycardia), pallor
(not flushing), and hypotension (not hypertension) are also signs, restlessness and
confusion are key early indicators.
Question 6: The dialysate solution used in conventional hemodialysis typically
contains which of the following electrolytes at a concentration similar to that
of normal plasma?
A. Potassium and Calcium
B. Sodium and Bicarbonate
C. Chloride and Magnesium
D. Sodium and Potassium
,CORRECT ANSWER: B. Sodium and Bicarbonate
Rationale: The sodium concentration in dialysate is usually close to physiological plasma
levels (around 135-145 mEq/L) to prevent rapid shifts. Bicarbonate is used as the
primary buffer to correct metabolic acidosis, and its concentration is also maintained
near physiological levels to maintain acid-base balance.
Question 7: A patient undergoing peritoneal dialysis reports severe abdominal
pain and the effluent returns cloudy. What is the most probable diagnosis?
A. Constipation
B. Peritonitis
C. Catheter migration
D. Hernia
CORRECT ANSWER: B. Peritonitis
Rationale: Cloudy peritoneal effluent is the hallmark sign of peritonitis, an infection of
the peritoneal cavity. This is the most common and serious complication of peritoneal
dialysis. While the other options can cause abdominal pain, they do not typically present
with cloudy effluent.
Question 8: Which of the following medications is the primary anticoagulant
used during hemodialysis to prevent clotting in the extracorporeal circuit?
A. Aspirin
B. Warfarin
C. Heparin
D. Enoxaparin
CORRECT ANSWER: C. Heparin
Rationale: Unfractionated Heparin is the most commonly used anticoagulant during
hemodialysis due to its rapid onset, short half-life, and reversibility with protamine
sulfate. Aspirin and Warfarin are not typically used for this purpose, and Enoxaparin is a
low-molecular-weight heparin usually reserved for other indications.
Question 9: The primary function of a dialyzer (artificial kidney) is to facilitate
the movement of solutes and water across a semipermeable membrane. This
process is primarily driven by:
A. Active transport and filtration
B. Diffusion and convection
C. Osmosis and active transport
D. Ultrafiltration and phagocytosis
CORRECT ANSWER: B. Diffusion and convection
Rationale: Dialysis works through two primary principles: Diffusion (movement of
solutes from high to low concentration) and Convection (movement of solutes with
, water across a pressure gradient, also known as ultrafiltration). Active transport is not a
mechanism of the artificial membrane.
Question 10: Which nursing intervention is most critical for preventing
infection at a hemodialysis central venous catheter exit site?
A. Applying an antibiotic ointment daily
B. Changing the dressing using aseptic technique
C. Keeping the catheter clamped at all times when not in use
D. Flushing the catheter with heparin daily
CORRECT ANSWER: B. Changing the dressing using aseptic technique
Rationale: The use of strict aseptic technique during dressing changes is the single most
important intervention to prevent catheter-related bloodstream infections (CRBSIs).
Antibiotic ointments are generally not recommended due to fungal resistance, clamping
the catheter isn't directly related to infection, and heparin flushing prevents thrombosis,
not infection.
Question 11: In a patient receiving hemodialysis, a "dry weight" (target
weight) is defined as:
A. The patient's weight immediately after dialysis
B. The weight at which the patient is normotensive and free of edema
C. The ideal body weight based on the patient's height and age
D. The weight at which the patient experiences muscle cramps
CORRECT ANSWER: B. The weight at which the patient is normotensive and
free of edema
Rationale: Dry weight is the patient's weight after all excess fluid has been removed,
resulting in the absence of edema, clear lungs, and normotension. It is the target for
ultrafiltration, though it can fluctuate.
Question 12: Which of the following dietary minerals is most rigorously
restricted for patients on hemodialysis to prevent life-threatening cardiac
arrhythmias?
A. Sodium
B. Phosphorus
C. Potassium
D. Calcium
CORRECT ANSWER: C. Potassium
Rationale: Hyperkalemia (high potassium) is a potentially fatal complication of renal
failure that can cause cardiac arrhythmias and sudden death. While sodium and
phosphorus are also restricted, potassium restriction is most critical regarding acute life-
threatening cardiac risks.
