Free CDN Practice Tests (2026)
Start with the free diagnostic to see where you stand, then practice in tutor or timed mode. Full-length simulations match the real CDN.
Diagnostics
CDN Practice Test 1
10 questions · 12 min10 free CDN practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
Start testPractice tests
CDN Practice Test 2
10 questions · 12 min10 free CDN practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
Start testCDN Practice Test 3
5 questions · 10 min5 free CDN practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
Start testHow these CDN practice tests match the real exam
The real Certified Dialysis Nurse (CDN) Exam has 150 questions and a 180-minute time limit. Question types: Multiple choice. Each practice test here uses the same question formats, so you get used to how CDN questions are asked before test day.
The tests draw on every CDN content area, weighted like the official outline:
- Chronic HD Unit (ESRD) (about 52% of the exam)
- Concepts of Kidney Disease in Adults (about 32% of the exam)
- Chronic HD Unit (AKI & DGF) (about 8% of the exam)
- Water for Dialysis (about 8% of the exam)
Use tutor mode to see the explanation after each answer, or timed mode to practise at real exam pace. Every answer comes with an explanation of why it is right and why the other options are wrong.