More study resources

About this exam

The Certified Diver Medic (DMT) credential is one of three certification pathways offered by the National Board of Diving and Hyperbaric Medical Technology (NBDHMT), a non-profit certifying organization whose stated purpose is to define and promote the safe application of diving medicine and hyperbaric oxygen therapy. The Board describes itself as designed to meet the clinical, technical and safety needs of undersea and hyperbaric medicine, and it certifies Diver Medics (DMT), Hyperbaric Technologists (CHT) and Hyperbaric Nurses (CHRN). This page is independent study material and is not affiliated with, endorsed by, or sponsored by the NBDHMT; always confirm requirements directly with the Board. For the DMT candidate, the published source material emphasizes that the diver medic must receive training and the skills necessary to undertake medical-control-physician-ordered invasive procedures, with the required skills identified in Appendix II of the Certified Diver Medic Approved Training Course Outline. The Board expects those skills to be maintained through periodic updating, consistent with NBDHMT recertification requirements and those of the medic's employer or medical control physician. Study planning should therefore cover diving medicine fundamentals, hyperbaric oxygen therapy practice and safety, clinical and technical skills including physician-ordered invasive procedures, and the codes and standards the Board says must be rigorously adhered to: ASME PVHO-1 and NFPA 99 Chapter 14. Candidates should also read the Board's position statements, since several directly shape day-to-day practice expectations. Specific exam length, time limit, passing score, fees and retake rules are not published in the source material reviewed here and should be verified with the Board.

What you'll study

Common questions

About DMT preparation

What does the DMT credential actually certify?

It is the Diver Medic certification pathway offered by the NBDHMT alongside the CHT and CHRN pathways. The Board frames its mission around ensuring diving medicine and hyperbaric oxygen therapy are supported by appropriately qualified personnel through board certification pathways. Confirm current scope and eligibility directly with the Board.

What topics should I study first?

Start with the Board's own emphasis: training and skills to perform medical control physician ordered invasive procedures, per Appendix II of the Certified Diver Medic Approved Training Course Outline. Then build outward into hyperbaric oxygen therapy practice and the codes the Board says must be rigorously adhered to.

Which codes and standards does the Board say must be followed?

The Board's position statement on recognized hyperbaric safety codes and standards names ASME PVHO-1, the Safety Standard for Pressure Vessels for Human Occupancy, and NFPA 99, Health Care Facilities Code, Chapter 14 (Hyperbaric Facilities), stating both should be rigorously adhered to. Expect questions that test practical application of these, not just names.

Are invasive procedures really part of the DMT scope?

Yes. The Board's 2018 position statement says the diver medic must receive training and skills necessary to undertake medical control physician ordered invasive procedures, with required skills identified in Appendix II of the Approved Training Course Outline. It also expects those skills to be maintained through periodic updating.

How hard is the exam, and what trips candidates up?

The source material does not publish a difficulty rating or pass rate, so treat any specific claim with suspicion. The most defensible preparation is deep familiarity with the Board's position statements, because they set out concrete operational expectations, plus the code requirements in ASME PVHO-1 and NFPA 99 Chapter 14.

Do I need to recertify, and how often?

The Board states that certification should be provided by an authoritative certification organization that requires periodic recertification based upon maintenance of requisite knowledge and skills, and it references NBDHMT recertification requirements. The specific interval is not given in the source material reviewed, so verify the current cycle with the Board.

What are the exam format, length, time limit, fee and passing score?

These details are not stated in the source material reviewed for this page, so they are not reproduced here rather than guessed. Check the Board's certification testing pages and downloadable forms for the current figures before you schedule.

If I fail, what is the retake policy?

The source material reviewed does not describe a retake policy, so no number of attempts, waiting period, or fee is stated here. Contact the Board directly through its published contact details to confirm retake rules and any associated costs before sitting the examination.

Should I read the position statements as part of preparation?

Yes. They translate standards into practice: physician attendance and supervision expectations, intermittent air breathing to prophylax against central nervous system oxygen toxicity, hyperbaric safety director appointment, acceptable chamber clothing without pockets, and limits on portable fabric low-pressure chambers. These are concrete, testable operational points.