CERTIFIED NEPHROLOGY NURSE (CNN)
EXAMINATION QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWLOAD PDF
1. Which organ is primarily responsible for maintaining fluid
and electrolyte balance in the body?
A. Liver
B. Heart
C. Kidneys
D. Lungs
Rationale: The kidneys regulate sodium, potassium, water, and
acid-base balance.
Correct Answer: C. Kidneys
2. The functional unit of the kidney is the:
A. Neuron
B. Nephron
C. Alveolus
D. Glomerulus
Rationale: The nephron is the microscopic structural and
functional unit of the kidney.
Correct Answer: B. Nephron
,3. Glomerular filtration primarily occurs in the:
A. Loop of Henle
B. Proximal tubule
C. Glomerulus
D. Collecting duct
Rationale: Filtration of blood plasma takes place in the
glomerulus.
Correct Answer: C. Glomerulus
4. The normal range for glomerular filtration rate (GFR) in
healthy adults is:
A. 10–30 mL/min
B. 30–60 mL/min
C. 90–120 mL/min
D. 150–200 mL/min
Rationale: Normal GFR is approximately 90–120 mL/min.
Correct Answer: C. 90–120 mL/min
5. The primary hormone that stimulates red blood cell
production is:
A. Insulin
B. Erythropoietin
,C. Aldosterone
D. Cortisol
Rationale: Erythropoietin is produced by the kidneys and
stimulates RBC production.
Correct Answer: B. Erythropoietin
6. A common cause of chronic kidney disease (CKD) is:
A. Asthma
B. Diabetes mellitus
C. Appendicitis
D. Otitis media
Rationale: Diabetes is the leading cause of CKD worldwide.
Correct Answer: B. Diabetes mellitus
7. The most accurate indicator of renal function is:
A. Blood urea nitrogen (BUN)
B. Serum creatinine
C. Urine color
D. Blood glucose
Rationale: Serum creatinine best reflects kidney filtration
ability.
Correct Answer: B. Serum creatinine
, 8. Hemodialysis works primarily by:
A. Active transport
B. Osmosis only
C. Diffusion across a semipermeable membrane
D. Filtration by liver
Rationale: Waste removal occurs via diffusion in dialysis.
Correct Answer: C. Diffusion across a semipermeable
membrane
9. The dialysate is best defined as:
A. Patient blood
B. Sterile saline only
C. A solution used to remove waste during dialysis
D. Anticoagulant fluid
Rationale: Dialysate helps remove toxins and balance
electrolytes.
Correct Answer: C. A solution used to remove waste during
dialysis
10. The most common vascular access for long-term
hemodialysis is:
A. Central venous catheter
B. Arteriovenous fistula
EXAMINATION QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWLOAD PDF
1. Which organ is primarily responsible for maintaining fluid
and electrolyte balance in the body?
A. Liver
B. Heart
C. Kidneys
D. Lungs
Rationale: The kidneys regulate sodium, potassium, water, and
acid-base balance.
Correct Answer: C. Kidneys
2. The functional unit of the kidney is the:
A. Neuron
B. Nephron
C. Alveolus
D. Glomerulus
Rationale: The nephron is the microscopic structural and
functional unit of the kidney.
Correct Answer: B. Nephron
,3. Glomerular filtration primarily occurs in the:
A. Loop of Henle
B. Proximal tubule
C. Glomerulus
D. Collecting duct
Rationale: Filtration of blood plasma takes place in the
glomerulus.
Correct Answer: C. Glomerulus
4. The normal range for glomerular filtration rate (GFR) in
healthy adults is:
A. 10–30 mL/min
B. 30–60 mL/min
C. 90–120 mL/min
D. 150–200 mL/min
Rationale: Normal GFR is approximately 90–120 mL/min.
Correct Answer: C. 90–120 mL/min
5. The primary hormone that stimulates red blood cell
production is:
A. Insulin
B. Erythropoietin
,C. Aldosterone
D. Cortisol
Rationale: Erythropoietin is produced by the kidneys and
stimulates RBC production.
Correct Answer: B. Erythropoietin
6. A common cause of chronic kidney disease (CKD) is:
A. Asthma
B. Diabetes mellitus
C. Appendicitis
D. Otitis media
Rationale: Diabetes is the leading cause of CKD worldwide.
Correct Answer: B. Diabetes mellitus
7. The most accurate indicator of renal function is:
A. Blood urea nitrogen (BUN)
B. Serum creatinine
C. Urine color
D. Blood glucose
Rationale: Serum creatinine best reflects kidney filtration
ability.
Correct Answer: B. Serum creatinine
, 8. Hemodialysis works primarily by:
A. Active transport
B. Osmosis only
C. Diffusion across a semipermeable membrane
D. Filtration by liver
Rationale: Waste removal occurs via diffusion in dialysis.
Correct Answer: C. Diffusion across a semipermeable
membrane
9. The dialysate is best defined as:
A. Patient blood
B. Sterile saline only
C. A solution used to remove waste during dialysis
D. Anticoagulant fluid
Rationale: Dialysate helps remove toxins and balance
electrolytes.
Correct Answer: C. A solution used to remove waste during
dialysis
10. The most common vascular access for long-term
hemodialysis is:
A. Central venous catheter
B. Arteriovenous fistula
