1. History of Undersea and Hyperbaric Medicine
Key exam domainIdentify weak areas and improve with focused review.
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2. The Physical Aspects of Undersea and Hyperbaric Medicine
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing3. The Physiological Aspects of Undersea and Hyperbaric Medicine
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing4. Mechanisms and Theory of Decompression
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing5. Therapeutic Mechanisms Associated with Hyperbaric Oxygen Exposure
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing6. Currently Accepted Indications for Hyperbaric Oxygen Exposure
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing7. Oxygen Toxicity
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing8. Other Potential Complications
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing9. The Hyperbaric Medicine Facility
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing10. Hyperbaric Safety I. Protecting the Environment
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing11. Hyperbaric Safety II. Protecting the Patient
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing12. Understanding of the NFPA guidelines for hyperbaric chambers
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing13. Transcutaneous Oxygen Monitoring
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing14. Nursing Management of the Patient Undergoing Hyperbaric Oxygen Therapy
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing15. Nursing Standards of Practice: Ref BNA Hyperbaric Nursing Standards found on BNA website
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing16. Understanding of basic operation of all hyperbaric chambers including Monoplace and Multiplace chambers
Key exam domainIdentify weak areas and improve with focused review.
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Frequently asked questions
Straight answers about the CHRN exam, the questions, pricing, the free trial, and how this fits your prep.
The CHRN exam spans 16 domains - History of Undersea and Hyperbaric Medicine, The Physical Aspects of Undersea and Hyperbaric Medicine, The Physiological Aspects of Undersea and Hyperbaric Medicine, Mechanisms and Theory of Decompression, Therapeutic Mechanisms Associated with Hyperbaric Oxygen Exposure, Currently Accepted Indications for Hyperbaric Oxygen Exposure, Oxygen Toxicity, Other Potential Complications, The Hyperbaric Medicine Facility, Hyperbaric Safety I. Protecting the Environment, Hyperbaric Safety II. Protecting the Patient, Understanding of the NFPA guidelines for hyperbaric chambers, Transcutaneous Oxygen Monitoring, Nursing Management of the Patient Undergoing Hyperbaric Oxygen Therapy, Nursing Standards of Practice: Ref BNA Hyperbaric Nursing Standards found on BNA website, and Understanding of basic operation of all hyperbaric chambers including Monoplace and Multiplace chambers. Every practice question maps to one of them, so you train on exactly what's tested.
The Certified Hyperbaric Registered Nurse (CHRN) exam has 120 questions and is completed in 2 hours. Our timed practice tests mirror that length and pacing, so exam day feels familiar.
No - and that matters. These are original practice questions written to mirror the style, difficulty, and domain coverage of the CHRN exam blueprint. We never distribute actual exam content, so practicing here keeps you fully compliant with official exam policies.
No. CHRN Exam Prep is an independent study resource for Certified Hyperbaric Registered Nurse (CHRN). It is not affiliated with, sponsored by, or endorsed by the official certifying body or exam administrator.
Every paid plan unlocks the full bank of 1,000+ practice questions covering all 16 CHRN domains - History of Undersea and Hyperbaric Medicine, The Physical Aspects of Undersea and Hyperbaric Medicine, The Physiological Aspects of Undersea and Hyperbaric Medicine, Mechanisms and Theory of Decompression, Therapeutic Mechanisms Associated with Hyperbaric Oxygen Exposure, Currently Accepted Indications for Hyperbaric Oxygen Exposure, Oxygen Toxicity, Other Potential Complications, The Hyperbaric Medicine Facility, Hyperbaric Safety I. Protecting the Environment, Hyperbaric Safety II. Protecting the Patient, Understanding of the NFPA guidelines for hyperbaric chambers, Transcutaneous Oxygen Monitoring, Nursing Management of the Patient Undergoing Hyperbaric Oxygen Therapy, Nursing Standards of Practice: Ref BNA Hyperbaric Nursing Standards found on BNA website, and Understanding of basic operation of all hyperbaric chambers including Monoplace and Multiplace chambers. You can practice the whole bank, filter by domain, or run a timed, domain-balanced exam simulation.
Yes - the bank is maintained against the current exam outline, and questions are revised when the exam changes.
No honest practice platform can guarantee a pass. What realistic practice does is show you - before exam day - exactly which domains are weak, and give you the repetitions to fix them. That's the difference between hoping you're ready and knowing where you stand.
Yes. You get 10 free sample questions with instant feedback - no credit card and no account required.
The free sample shows you the question quality. Paid plans unlock the full 1,000+ question bank, exam-style practice modes, mistake review, and - on Fast Track and Pass Confidence - progress analytics that show your readiness by domain.
No. Every plan is a single one-time payment for a fixed access window - 48 hours, 7 days, or 6 weeks. There is no auto-renewal and no recurring billing.
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Every answer feeds your per-domain accuracy, readiness score, and weak-area list. Instead of re-reading everything, you drill the domains that are actually costing you points - that's what moves a score in days, not months.
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"put off studying for weeks and then panicked bc the oxygen toxicity section alone felt like its own exam. did a bunch of practice questions on chrnexam.com the last two weeks and that part finally clicked. passed, still kinda in shock."
"honestly wasnt sure a prep site could actually help with something as niche as this cert but the mistake review feature caught how bad i was at the decompression tables. kept missing the same question types until i actually drilled them. def helped more than just rereading the manual over and over."
"studied on my lunch breaks for about a month, nothing crazy. the practice sets on NFPA chamber stuff and TcPO2 were seperate from the clinical questions which made it easier to tell where i was weak. passed first try, no notes."