CNN Practice Test 2026 — Free CNN Exam Prep Questions
The CNN exam validates proficient-level registered nurse practice across the full scope of nephrology care, from chronic kidney disease through acute therapies, home dialysis and transplant. Our practice set follows the NNCC blueprint effective September 2026 with clinical vignettes and a rationale for every option.
Five months after a kidney transplant, a patient's creatinine has risen from 1.2 to 1.7 mg/dL. The patient reports a new hand tremor and headaches. Potassium is 5.7 mEq/L, magnesium 1.3 mg/dL, and the tacrolimus trough is well above the target range. BP is 158/94 mm Hg. Urine output is unchanged and there is no graft tenderness or fever. What is the most likely cause?
CNN format, scoring & key facts
Facts last verified Oct 5, 2026. Source: www.nncc-exam.org/sites/default/files/blueprints/cnnExamBlueprint.pdf. Always confirm details with NNCC before your exam.
When can you take the CNN?
Plan backwards from your exam date
What the CNN covers
Every PrepBanq CNN test mirrors the official domain weights.
Domain distribution
% of the exam| Content domain | Weight | ≈ Questions on exam | Our practice questions |
|---|---|---|---|
Concepts of Kidney Disease Across the Life SpanCKD staging and progression, electrolyte and acid-base disorders, CKD-MBD, anemia, uremic complications, vascular access planning and conservative care. | 30% | ~45 | 7 questions → |
Acute In-patient TherapiesAcute kidney injury, in-hospital hemodialysis, continuous kidney replacement therapy, apheresis and inpatient infection control. | 25% | ~38 | 6 questions → |
Peritoneal DialysisPD physiology and transport, prescriptions and solutions, catheter function, peritonitis and exit-site care, nutrition and patient teaching. | 20% | ~30 | 5 questions → |
Home HemodialysisHome HD training, cannulation techniques, water treatment, machine safety, frequent/nocturnal regimens and care-partner support. | 15% | ~23 | 4 questions → |
TransplantImmunosuppression and drug levels, rejection versus drug toxicity, infection prevention and post-transplant teaching. | 10% | ~15 | 3 questions → |
Your path to passing the CNN
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CNN FAQ
How many questions are on the CNN?
The CNN has 150 questions and you have 3 hours to finish. Question types: Multiple choice (single best answer); no calculator-dependent items.
How long is the CNN exam?
Testing time for the CNN is 3 hours.
What is on the CNN?
The CNN covers Concepts of Kidney Disease Across the Life Span (about 30%), Acute In-patient Therapies (about 25%), Peritoneal Dialysis (about 20%), Home Hemodialysis (about 15%), Transplant (about 10%).
Who administers the CNN?
The Certified Nephrology Nurse (CNN) Exam is administered by NNCC.
Is there a free CNN practice test?
Yes. PrepBanq has 3 free CNN practice tests with 25 exam-style questions in the real CNN formats, and every answer is explained. No credit card is needed.
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