The person who runs your HBOT chamber controls your safety. Pressure rates, oxygen flow, crisis response, and fire steps all sit with the chamber tech. Checking that the tech is certified is a basic safety step most new patients skip.
This guide explains the main US hyperbaric credentials, what each one covers, and how to verify them. It also covers the medical director role and how to check the doctor in charge.
The frame: HBOT chamber work is a regulated skill at accredited centers. The credentials exist for good reason — fire and oxygen risks make untrained work risky.
The CHT credential
The Certified Hyperbaric Technologist (CHT) is the main US credential for chamber operators. It is issued by NBDHMT.
CHT status requires documented chamber hours, a training course of about 40 hours, and passing the NBDHMT exam. The exam covers chamber physics, oxygen risks, fire safety, crisis steps, and patient care.
CHT techs renew every 2 years through training. The NBDHMT public directory 2025 lets you verify any current CHT credential by name and number.
For more on what UHMS accreditation means at the facility level, see our UHMS accreditation explainer.
The CHWS credential
The Certified Hyperbaric and Wound Specialist (CHWS) is a related credential that pairs HBOT and wound-care training. Many wound-care center staff hold this rather than the basic CHT.
The CHWS adds wound-care skills like wound photos, assessment, and dressing steps. It is a fit for staff at hospital wound-care programs.
NBDHMT issues both credentials, and the directory check process is the same.
The BNA credential for nurses
The Baromedical Nurses Association (BNA) certifies nurses who work in HBOT units. The credential is Certified Baromedical Registered Nurse (CBRN).
CBRN status requires RN licensure plus HBOT nursing time and passing the BNA exam. The exam covers chamber work, patient checks, crisis response, and the nursing-specific parts of care.
The BNA member directory 2025 is the verification source. Hospital-based hyperbaric units typically have certified nurses as inside attendants in multiplace chambers. See complete FDA-cleared chambers list for the complete chamber-by-chamber list.
The medical director credentials
A separate but critical credential. The doctor in charge — medical director — at a UHMS-accredited HBOT site must hold board status in undersea and hyperbaric medicine.
The credential comes from the American Board of Preventive Medicine or the American Board of Emergency Medicine. Both paths require an accredited fellowship and passing the subspecialty exam.
The American Board of Preventive Medicine 2024 directory and the American Board of Emergency Medicine 2024 directory let you verify board status.
For sites that are not UHMS-accredited, the medical director may have less formal training. Ask about board status.
How to verify credentials at your clinic
A short checklist before your first session.
Ask who will run the chamber. The clinic should be able to name the tech(s) and share credential details.
Verify the tech's CHT or CHWS in the NBDHMT directory 2025. The directory is public and free.
Verify the medical director's board status in the ABPM or ABEM directories. Ask if the director is on-site during sessions or available by phone.
Ask about staff training updates. Reputable clinics keep records of staff CE hours and chamber training.
If a clinic cannot or will not share credential info, that is a major red flag. For more on warning signs, see our clinic red flags guide.
What unaccredited clinics often look like
A real-world look at the wellness tier. Many soft-shell HBOT clinics are not UHMS-accredited and do not employ certified techs.
Common patterns: a chiropractor or physical therapist runs the chamber. A wellness-center owner with no medical training runs sessions. A massage therapist or acupuncturist provides oversight.
This does not mean every unaccredited clinic is unsafe. Some operators have done vendor-provided training and follow safety steps. Others have minimal training.
The trade-off. Unaccredited clinics offer lower per-session cost and easier access for off-label uses. Patients accept reduced safety checks in exchange.
Red flags in credential discussions
A few patterns worth knowing.
A clinic that says "our staff is trained" without sharing specific credentials is hedging. Real credentials have names, issuing bodies, and verification numbers.
A clinic that says credentials are not needed for mild HBOT is wrong. The fire and oxygen risks at 1.3 ATA are lower but not zero. Operator training still matters.
A clinic that points to a chamber maker's training instead of CHT credentials is offering a different level. Maker training is typically 1 to 2 days; CHT takes 40+ hours plus an exam.
A clinic that gets defensive when asked about credentials is signaling a problem. Reputable clinics share this openly.
Special considerations for pediatric and emergency care
A higher bar. Pediatric and emergency HBOT both need extra trained staff.
Pediatric HBOT is typically given at children's hospitals where staff have added training. CHT covers adult chamber work; pediatric care adds layers around child anatomy, sedation, and parents.
Emergency HBOT — CO poisoning, gas embolism, diving accidents — needs multiplace chambers and rapid-response staff. This is generally hospital-only. See the arterial gas embolism evidence atlas for the full study-by-study evidence breakdown.
For more on pediatric chamber considerations, see our pediatric chamber review.
What CHT certification actually covers
A summary of CHT training. The course covers:
Chamber physics. Pressure, gas laws, and chamber rules. The tech needs to know why pressure changes have the effects they do.
Oxygen-related harm. CNS and lung effects, dose curves, warning signs, and crisis response. See our oxygen-related harm explainer for the patient view.
Fire safety. The FDA-noted HBOT chamber fires are mostly preventable (FDA letter to providers 2014). Training covers risks like lithium batteries, oils, and synthetic fabrics, plus pre-session checks and fire steps.
Patient care. Pre-session checks, in-session watching, post-session checks, and crisis response.
Quality checks. Chamber upkeep, equipment checks, paperwork, and incident reports.
The total course is 40+ hours plus chamber hours, and the exam is broad.
Bottom line
Checking tech credentials is a basic safety step. CHT (NBDHMT-issued) is the main US tech credential, while BNA certifies nurses. Medical director board status (ABPM or ABEM) covers doctor oversight.
UHMS-accredited sites must employ properly credentialed staff and document ongoing training. Unaccredited wellness clinics have no such rule and staff training varies widely.
For any HBOT choice, ask about credentials before your first session and verify them in the public directories. A reasonable clinic will share this openly. A clinic that hedges is signaling a problem.
Related Reading
- UHMS-accredited HBOT facilities: what certification means
- HBOT clinic red flags: signs of unsafe practice
- HBOT side effects and safety: the real risk profile
- How to find a legitimate HBOT clinic near you
- How to verify a clinic's chamber is medical-grade
Frequently asked questions
What is the main HBOT tech credential?
The Certified Hyperbaric Technologist (CHT), issued by NBDHMT. The credential requires 40+ hours of training, documented chamber hours, and passing the NBDHMT exam.
How do I verify a tech's credentials?
Check the NBDHMT public directory. The directory is searchable by name and number. For nurses, check the BNA directory. For medical directors, use the ABPM or ABEM directories.
Do wellness HBOT clinics employ certified techs?
Often not. Many soft-shell chamber operators have only vendor-given training rather than CHT status. This does not mean the clinic is unsafe, but it removes a key quality check.
What credential should the medical director hold?
Board status in Undersea and Hyperbaric Medicine through the American Board of Preventive Medicine or the American Board of Emergency Medicine. UHMS-accredited sites require this.
What if a clinic will not share credential info?
That is a major red flag. Reputable clinics share staff credentials openly. A clinic that hedges or refuses is signaling a problem with their staff training.
Medical disclaimer: This guide is informational and does not constitute medical advice. HBOT carries real risks including ear injury, oxygen-related harm, and chamber fire. Discuss any HBOT plan with a doctor trained in hyperbaric medicine before starting. The FDA has cleared HBOT for 13 specific uses; uses outside that list are off-label.
-- The HBOT Finder Team