Format at a glance
| Item | Detail |
|---|---|
| Questions | Multiple-choice, objective questions; ABRET doesn't publish the number |
| Time | 4 hours |
| Delivery | Prometric test centers, Monday to Saturday (no remote option listed) |
| Testing window | 3 months from your "Eligible to Test" date |
| Fee | US$700 application fee (2026) |
| Pass mark | Not published; ABRET's Board sets the number of correct answers needed for each exam form |
| Results | Unofficial result by email at the test center; official result in about 4 to 6 weeks |
The five domains
- Provider Communication and Documentation (27%): confirming the monitoring plan, reporting baselines, real-time reporting of significant events, contemporaneous annotation.
- Preparation and Application of Fundamental Concepts (25%): patient history and structures at risk, pre-op neuro assessment, equipment and electrode setup, and the neurophysiology and instrumentation behind it.
- Intraoperative Phase (25%): baselines and impedance, recognizing signal changes from surgical, anesthetic, technical or physiologic causes, troubleshooting.
- Post-Operative Phase (13%): electrode removal and sharps, cleaning and disinfection, post-op neuro assessment.
- Safety and Ethics (10%): equipment inspection and impoundment, universal precautions, distance from the sterile field, the ABRET Code of Ethics.
What gets tested most
Expect a lot of applied neurophysiology: SSEP and BAEP generators (N9, N13, P14, N20, P37, waves I, III and V), which anesthetic agents affect which modalities, alarm criteria, and the right first action when signals change. Communication carries the largest weighting, so practise questions that ask who you tell, when, and what you document. The handbook's sample questions also include medical terminology, so don't skip the vocabulary.
See where you stand in 10 minutes
Take the free CNIM practice test. 15 questions, every answer explained.
Pacing
ABRET doesn't publish the question count, so build stamina for the full 4 hours. In practice, keep a steady rhythm: answer recall questions quickly, flag scenario questions you can't settle within about two minutes, and leave time for a review pass. Never leave a question blank.
An 8-week plan
- Weeks 1-2: instrumentation (amplifiers, filters, averaging, stimulators) and electrode placement. Daily flashcards.
- Weeks 3-4: SSEPs, BAEPs, MEPs and EMG: generators, parameters and what each change means.
- Weeks 5-6: anesthesia and physiology, alarm criteria, communication and documentation, post-op care, safety and ethics. First full timed mock.
- Weeks 7-8: clear your mistakes bank, take a second full 4-hour mock, then light review only in the last two days.
Frequently asked questions
How many questions are on the CNIM exam?
ABRET doesn't publish the number. The handbook describes multiple-choice, objective questions with a total testing time of 4 hours.
What is the CNIM pass mark?
ABRET doesn't publish a fixed percentage. Its Board sets the number of correct answers needed to be judged at least minimally competent on each exam form. Aim for 75% or more in timed practice before you sit.
Can I take the CNIM exam online?
The 2026 handbook lists only Prometric test centers, Monday to Saturday, excluding holidays.
What should I read for the CNIM?
ABRET's handbook lists recommended texts, including Husain's A Practical Approach to Neurophysiologic Intraoperative Monitoring, Simon's Intraoperative Neurophysiology, Møller, Nuwer, and the ACNS and ASNM guidelines.
Official sources
Practice tests for these certifications
This guide is general information, checked November 2026, not legal advice. ABRET rules change; confirm with ABRET before you apply.
