CDN Practice Test 2026 — Free CDN Exam Prep Questions
The CDN is NNCC's specialty credential for registered nurses who work in dialysis. Our practice questions follow NNCC's current CDN test blueprint, with chair-side hemodialysis vignettes on treatment principles, complications, vascular access, medications, infection control, patient teaching, AKI and delayed graft function care, and dialysis water treatment.
Several patients in a unit develop nausea, hypotension and a sudden fall in hemoglobin during treatment on the same shift. The total chlorine test after the carbon tanks was not done that morning. Which complication is most likely, and what was the missed safeguard?
CDN format, scoring & key facts
Computer-based testing (CBT).
Facts last verified Oct 5, 2026. Source: www.nncc-exam.org/sites/default/files/blueprints/cdnExamBlueprint.pdf. Always confirm details with NNCC before your exam.
When can you take the CDN?
Plan backwards from your exam date
What the CDN covers
Every PrepBanq CDN test mirrors the official domain weights.
Domain distribution
% of the exam| Content domain | Weight | ≈ Questions on exam | Our practice questions |
|---|---|---|---|
Chronic HD Unit (ESRD)Chronic hemodialysis for ESRD: treatment principles and adequacy, intradialytic complications, vascular access, medications, infection control, teaching and team/regulatory duties. | 52% | ~78 | 13 questions → |
Concepts of Kidney Disease in AdultsCKD staging and causes, mineral-bone disorder, anemia, uremic complications, nutrition, drug safety and psychosocial care. | 32% | ~48 | 8 questions → |
Chronic HD Unit (AKI & DGF)Outpatient dialysis of patients with acute kidney injury or delayed graft function: recovery monitoring and special precautions. | 8% | ~12 | 2 questions → |
Water for DialysisWater treatment and monitoring: chlorine/chloramine removal, microbial and endotoxin limits and related patient complications. | 8% | ~12 | 2 questions → |
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CDN FAQ
How many questions are on the CDN?
The CDN has 150 questions and you have 3 hours to finish. Question types: Multiple choice.
How long is the CDN exam?
Testing time for the CDN is 3 hours.
What is the passing score for the CDN?
CDN passing standard: Standard score of 95 (about 70% of items correct).
What is on the CDN?
The CDN covers Chronic HD Unit (ESRD) (about 52%), Concepts of Kidney Disease in Adults (about 32%), Chronic HD Unit (AKI & DGF) (about 8%), Water for Dialysis (about 8%).
Who administers the CDN?
The Certified Dialysis Nurse (CDN) Exam is administered by NNCC. Delivery: Computer-based testing (CBT).
Is there a free CDN practice test?
Yes. PrepBanq has 3 free CDN practice tests with 25 exam-style questions in the real CDN formats, and every answer is explained. No credit card is needed.
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