Hyperbaric nurses manage patients receiving hyperbaric oxygen therapy (HBOT) — a treatment that delivers 100% oxygen at two to three times normal atmospheric pressure to accelerate healing in wounds, injuries, and conditions where tissue oxygen supply has been severely compromised. The core path is: RN license, two or more years of relevant clinical experience (wound care, ICU, or emergency nursing), completion of an NBDHMT-accredited hyperbaric medicine course, and 480 hours of supervised hyperbaric patient care before sitting for the CHRN exam.
It is a small, specialized field — most hospital systems run one or two hyperbaric units at most — but demand for hyperbaric-trained nurses has grown alongside the expansion of outpatient wound care centers and the rise of diabetic complications driving chronic wound prevalence.
Quick answer:
- Earn an ADN or BSN and pass NCLEX-RN
- Build 2+ years of clinical experience in wound care, ICU, or emergency nursing
- Complete an NBDHMT-accredited introductory hyperbaric medicine course
- Log 480 hours of supervised direct hyperbaric patient care with a CHRN preceptor
- Apply for and pass the CHRN exam through NBDHMT/BNACB
- Pursue ACHRN for advanced roles in program leadership or clinical specialization
What does a hyperbaric nurse do?
Hyperbaric oxygen therapy works on a straightforward physiological principle: at elevated pressure, oxygen dissolves into plasma at concentrations far higher than under normal atmospheric conditions. That oxygen-saturated plasma can reach tissues that red blood cells cannot — ischemic wound beds, radiation-damaged tissue, bone compromised by infection, or regions where gas emboli have blocked blood flow.
The hyperbaric nurse manages the patient across three phases of every treatment session.
Pre-treatment assessment involves reviewing contraindications (untreated pneumothorax, certain chemotherapy agents, claustrophobia), checking vital signs, confirming the patient has not used petroleum-based products (fire risk in a pure-oxygen environment), reviewing current medications, and educating the patient on what to expect during pressurization — particularly ear equalization, which many patients find uncomfortable initially.
In-chamber monitoring is where hyperbaric nursing diverges most sharply from floor nursing. The nurse monitors the patient via observation windows or in-chamber seating (for multiplace chambers where the nurse enters with the patient). They watch for signs of oxygen toxicity — most critically, CNS oxygen toxicity presenting with facial twitching, visual changes, nausea, or tonic-clonic seizure. They also monitor for barotrauma (middle ear squeeze is the most common) and anxiety or claustrophobia-related distress.
Post-treatment care includes vital sign monitoring during and after decompression, wound reassessment, patient education about treatment frequency and expected timeline, and documentation of the session.
Beyond individual treatment sessions, hyperbaric nurses often carry wound care responsibilities in the same clinic: assessing and dressing diabetic foot ulcers, radiation wounds, and surgical wounds; coordinating with vascular surgeons, podiatrists, and infectious disease specialists; and participating in multidisciplinary wound rounds.
The role also involves equipment maintenance awareness — understanding chamber pressurization systems, oxygen delivery equipment, and emergency decompression protocols — though hands-on equipment servicing is typically the domain of hyperbaric technicians.
Conditions treated with HBOT
| Condition | Why HBOT is used |
|---|---|
| Diabetic foot ulcers (Wagner Grade III–IV) | Restores oxygen to ischemic wound tissue; the most common indication in outpatient programs |
| Radiation necrosis (osteoradionecrosis, soft tissue radionecrosis) | Stimulates angiogenesis in radiation-damaged tissue; supports dental implants post-radiation |
| Osteomyelitis (refractory) | Enhances leukocyte oxygen-dependent killing of bacteria; used adjunctively with antibiotics |
| Carbon monoxide poisoning | Accelerates dissociation of CO from hemoglobin; reduces carboxyhemoglobin half-life from ~5h (room air) to ~80 min (HBOT) |
| Necrotizing fasciitis and gas gangrene | Inhibits anaerobic bacteria; reduces tissue spread and supports surgical margins |
| Crush injuries and compartment syndrome | Reduces edema and improves microvascular perfusion in traumatized tissue |
| Non-healing surgical wounds | Addresses hypoxic wound environments following surgery or vascular compromise |
| Central retinal artery occlusion | Time-critical: HBOT preserves retinal tissue pending revascularization |
| Decompression sickness | Primary treatment modality; reverses nitrogen bubble formation in divers |
Work settings
Hyperbaric nurses work in a range of settings, each with a different patient mix and practice environment.
Hospital-based outpatient wound care centers represent the largest employer category. These programs — typically housed in an outpatient pavilion attached to a hospital system — combine wound care clinic services with one or more hyperbaric chambers. Patient volume is predictable (scheduled appointments), hours are generally daytime, and the clinical team includes wound care nurses, physicians, and a hyperbaric technician. Most diabetic foot ulcer and radiation necrosis patients are seen here.
Freestanding outpatient hyperbaric clinics operate independently of a hospital system. These programs tend to be smaller, may have fewer support resources, but often offer more autonomy and a tighter-knit team environment.
Academic medical centers frequently operate both wound care and hyperbaric programs and may treat a broader acuity range including post-surgical wound complications and more complex radiation injuries. Teaching environments means more student and resident interaction.
Military and naval facilities employ hyperbaric nurses for both wound care and diving medicine — decompression sickness, arterial gas embolism, and blast injury management. These are relatively rare positions but represent a distinct subspecialty. The Navy Experimental Diving Unit and various military treatment facilities maintain hyperbaric capabilities.
VA hospitals and federal facilities treat both wound care patients and veterans with diving-related histories. VA pay is structured under Title 38 rather than GS scales, which affects compensation calculations.
| Setting | Typical patient population | Usual schedule | Notes |
|---|---|---|---|
| Hospital outpatient wound center | Diabetic foot ulcers, radiation necrosis, chronic wounds | Mon–Fri daytime | Largest employer type; stable volume |
| Freestanding hyperbaric clinic | Mix of wound care and elective HBOT | Mon–Fri daytime | Smaller teams; more autonomous |
| Academic medical center | Complex wounds, post-surgical complications, academic referrals | Daytime; may include weekends | Teaching environment; higher acuity mix |
| Military / naval facility | Decompression sickness, blast injury, diving medicine | Variable; on-call capability required | Rare positions; diving medicine subspecialty |
| VA hospital | Veterans with wounds, diving injuries, radiation exposure | Daytime; Title 38 pay structure | Federal benefits; pension-eligible |
Steps to become a hyperbaric nurse
The path to hyperbaric nursing is not a straight line from nursing school — it runs through clinical nursing first. No program will hire a new graduate into a hyperbaric role.
Step 1: Earn an RN license. Both ADN and BSN graduates are eligible for CHRN certification, but most hospital systems now prefer or require a BSN for permanent clinical positions. Complete an accredited nursing program and pass the NCLEX-RN. For the hyperbaric specialty, a strong foundation in anatomy and physiology, pharmacology, and clinical assessment will matter more than any particular concentration.
Step 2: Build relevant clinical experience. CHRN eligibility requires a minimum of two years of clinical experience in a hospital or hospital-based clinic setting, or one year of critical care experience. The strongest background for hyperbaric nursing comes from:
- Wound care nursing — direct preparation for the largest part of the role
- ICU or critical care nursing — builds patient monitoring skills, comfort with complex physiology, and familiarity with emergency management
- Emergency department nursing — common pathway, particularly for nurses interested in diving medicine or acute HBOT indications
Two to three years in one of these settings is the practical baseline before seeking a hyperbaric position. Some nurses move into hyperbaric work after five or more years in wound care or critical care; that depth of experience is competitive.
Step 3: Complete NBDHMT-approved hyperbaric medicine training. Before sitting for the CHRN exam, you must complete an entry-level hyperbaric medicine course accredited by the National Board of Diving and Hyperbaric Medical Technology (NBDHMT). These courses — typically 40 hours — are offered through hospital wound care programs, the Baromedical Nurses Association (BNA), and independent training organizations. Course attendance must be within five years of your application; if more than five years have passed, you must demonstrate 30 Category A (hyperbaric-related) continuing education units instead.
Step 4: Log 480 hours of supervised hyperbaric patient care. Candidates must complete a minimum of one year of active hyperbaric medicine experience within the last two years, including 480 hours of direct hyperbaric patient care. These hours must be recorded and signed by a CHRN preceptor — a certified hyperbaric nurse who supervises and attests to your clinical experience. This requirement means you typically need to secure a position in a hyperbaric unit before you can complete your certification application.
Step 5: Sit for the CHRN exam. Once eligibility is confirmed, you register for the exam through NBDHMT at least 30 days before your chosen test date. The exam covers hyperbaric medicine principles, patient assessment in pressurized environments, wound healing, equipment safety, and nursing-specific clinical decision-making.
Step 6 (optional): Pursue ACHRN for advanced roles. After four or more years of hyperbaric experience and with your CHRN in hand, the ACHRN (Advanced Certified Hyperbaric Registered Nurse) is available for nurses moving into program leadership, clinical education, or complex case management.
CHRN certification in detail
The CHRN credential is issued through a partnership between the National Board of Diving and Hyperbaric Medical Technology (NBDHMT) and the Baromedical Nurses Association Certification Board (BNACB). The NBDHMT administers training standards and examination infrastructure; the BNACB validates candidate requirements and maintains the credentialing process.
The Undersea and Hyperbaric Medical Society (UHMS) plays a separate but complementary role: UHMS accredits hyperbaric programs at the facility level (not individual nurses), sets clinical standards for HBOT indications, and functions as the primary professional society for the field. UHMS membership is not required for CHRN eligibility, but UHMS members receive a reduced exam fee.
Eligibility requirements
To sit for the CHRN exam, candidates must meet all of the following:
- Current, active, unrestricted RN license in their state of practice
- Minimum two years of clinical experience in a hospital or hospital-based clinic (or one year of critical care experience as an RN)
- Completion of an NBDHMT-accredited entry-level hyperbaric medicine course within the past five years (or 30 Category A CEUs if training was more than five years ago)
- Minimum one year of active hyperbaric medicine experience within the past two years, including 480 hours of direct hyperbaric patient care documented and signed by a CHRN preceptor
Exam format
The CHRN exam contains 120 multiple-choice questions. The exam content reflects a specific weighting: 40% covers nursing-specific activities (assessment, patient education, clinical decision-making, documentation), with the remaining 60% covering technical content, safety protocols, chamber operations, and the physiological principles underlying hyperbaric medicine. The pass threshold is 70%, and the exam takes approximately two hours to complete.
Exam fees
| Membership status | Exam fee |
|---|---|
| Baromedical Nurses Association (BNA) member | $250 |
| UHMS or ACHM member | $300 |
| Non-member | $400 |
| Exam retake | $100 |
Recertification
CHRN certification is valid for four years. Recertification requires:
- 40 hours of continuing education within the four-year period
- At least 20 of those hours specific to hyperbaric medicine (Category A CEUs)
- Evidence of ongoing clinical practice
- Recertification fees: $150 (BNA members), $200 (UHMS/ACHM members), $250 (non-members)
Lapses can be reinstated with an additional $100 reinstatement fee.
Why CHRN matters for employment and pay
CHRN is not universally required to work in a hyperbaric unit — some facilities hire eligible RNs and support them toward certification. But CHRN-credentialed nurses are substantially more competitive for supervisory roles, program coordinator positions, and travel contracts. Many hospital wound care programs list CHRN as preferred or required for senior staff positions. The credential also provides a meaningful salary premium over non-certified RNs working in the same setting — typically $5,000–$10,000 per year, with higher premiums at academic and specialty centers. See the hyperbaric nurse salary guide for a full breakdown.
ACHRN advanced certification
The Advanced Certified Hyperbaric Registered Nurse (ACHRN) represents the highest credentialing tier in hyperbaric nursing and is designed for nurses who have moved beyond routine HBOT management into leadership, education, or complex clinical specialization.
Who should pursue ACHRN
The ACHRN makes sense for nurses who:
- Are managing a hyperbaric program (director, coordinator, or charge roles)
- Provide clinical education or preceptor supervision for other hyperbaric nurses
- Work in high-complexity environments (academic medical centers, military facilities, diving medicine centers)
- Are building a career in hyperbaric medicine consulting or research
Requirements
ACHRN candidates must already hold active CHRN certification. Additional requirements include:
- Minimum four years of hyperbaric clinical experience (compared to one year for CHRN)
- Currently working at least 480 hours per year in hyperbaric clinical or administrative roles
- Demonstrated contribution to the field — through teaching NBDHMT/BNACB-approved courses, serving in a leadership or committee role with relevant professional organizations, or having primary responsibility for planning and coordinating nursing care programs
- At least 60 contact hours of hyperbaric-related continuing education within the past four years
The ACHRN exam contains 100–120 multiple-choice questions covering advanced content in chamber operations, oxygen toxicity management, wound healing physiology, and complex dive medicine scenarios. Application fee is approximately $150; exam fee runs $300–$350.
ACHRN certification renews every four years, requiring 60 continuing education hours (with at least 30 in hyperbaric medicine or wound healing) and evidence of ongoing clinical practice.
Skills and qualities
Wound care knowledge. The majority of hyperbaric patients are wound care patients. Understanding wound staging, debridement principles, dressing selection, and infection assessment makes a hyperbaric nurse far more effective in multidisciplinary wound rounds and patient education.
Comfort with pressure physics. You do not need a physics degree, but you need a working understanding of Boyle’s law (volume and pressure), Henry’s law (gas dissolved in liquid), and Dalton’s law (partial pressures) — the three gas laws that underpin hyperbaric medicine. These principles explain everything from why ear equalization matters to why oxygen toxicity develops at depth.
Patient education and anxiety management. A significant proportion of hyperbaric patients are anxious about entering a pressurized chamber, particularly monoplace chambers that enclose the patient alone. The ability to prepare patients, manage claustrophobia, and coach ear equalization technique directly affects treatment completion rates.
Critical thinking under low-stimulation conditions. Most HBOT sessions are uneventful. The challenge is maintaining clinical vigilance for the rare but serious adverse events — CNS oxygen toxicity, acute barotrauma, fire risk from contamination — in an environment that is largely repetitive. Sustained attention is a genuine skill requirement.
Technical comfort. Hyperbaric nurses work with specialized equipment. You do not need to be a technician, but you need enough equipment literacy to recognize malfunction, communicate clearly with biomedical and chamber engineering staff, and follow emergency protocols confidently.
Physical tolerance of enclosed environments. Some monoplace chamber configurations require the nurse to sit or stand adjacent to a chamber for extended periods. A small number of multiplace chamber programs require the attending nurse to pressurize with the patient. Discomfort with enclosed or pressurized environments is a practical barrier in those roles.
Career outlook and advancement
The BLS projects 6% growth in registered nursing employment through 2033, roughly in line with overall healthcare employment. Hyperbaric nursing sits within that broader projection — it is not listed as a separate BLS category — but the forces driving demand are specifically favorable for the specialty.
The prevalence of type 2 diabetes and its complications (diabetic foot ulcers, peripheral arterial disease) continues to rise in the US, driving chronic wound volume. Radiation oncology volumes are also increasing as cancer survival rates improve, which means more patients living long enough to develop late radiation tissue injuries requiring HBOT. These are the two largest patient populations for outpatient hyperbaric programs.
The specialty remains small by nursing standards — most geographic markets have only a handful of CHRN positions — which creates both scarcity value for credentialed nurses and a realistic upper limit on local job market depth.
Advancement paths:
- Wound care program coordinator — oversees clinical operations for the combined wound care and hyperbaric program; typically a CHRN with 5+ years of experience
- Hyperbaric program director — manages the full program including staffing, quality assurance, UHMS accreditation compliance, and physician relations; often requires ACHRN or advanced wound care certification alongside strong management experience
- Clinical educator — develops training programs, preceptors new hyperbaric nurses, may work with NBDHMT-accredited training course providers
- Consulting and travel nursing — CHRN-credentialed nurses are in demand for travel contracts at facilities launching or temporarily understaffed in hyperbaric programs; rates are typically premium to permanent positions
For salary expectations at each level and in each setting, see the hyperbaric nurse salary guide.
Related specialties
If you are exploring hyperbaric nursing as part of a broader career interest in advanced wound care or critical access nursing, these guides cover adjacent pathways:
- How to become a travel nurse — travel contracts are common in hyperbaric nursing for CHRN-credentialed nurses
- How to become an ICU nurse — critical care experience is one of the fastest paths to CHRN eligibility
- How to become a flight nurse — another small, highly specialized field with overlapping patient physiology (dive medicine, trauma)
- How to become a CNS — Clinical Nurse Specialist is a natural advanced practice trajectory for hyperbaric nurses moving into education or program leadership
FAQ
How long does it take to become a hyperbaric nurse?
From the start of nursing school, plan for six to eight years: two to four years for your nursing degree, two to three years of post-licensure clinical experience building wound care or critical care background, then the period to log 480 supervised hyperbaric hours and complete your NBDHMT training. If you are already an experienced RN in wound care or ICU, the additional timeline to CHRN eligibility is roughly one to two years once you secure a hyperbaric position.
Do you need a BSN to become a hyperbaric nurse?
No BSN requirement appears in CHRN eligibility criteria — both ADN and BSN graduates can sit for the exam. In practice, most hospital-based hyperbaric programs have adopted BSN-preferred or BSN-required hiring standards for permanent positions, consistent with broader hospital nursing trends. ADN nurses working in hyperbaric settings often complete RN-to-BSN programs while working.
Is CHRN certification required to work as a hyperbaric nurse?
CHRN is not always required at the point of hire — some programs will hire an eligible RN and support the certification process. However, CHRN is widely listed as preferred or required for senior staff, supervisory, and travel contract positions. Without it, advancement into wound care coordinator or program director roles is limited.
What is the difference between CHRN and ACHRN?
CHRN is the entry-level credential for hyperbaric nursing, requiring one year of hyperbaric experience and completion of an approved training course. ACHRN (Advanced Certified Hyperbaric Registered Nurse) requires active CHRN certification, a minimum of four years of hyperbaric experience, demonstrated leadership or education contributions to the field, and 60 contact hours of advanced continuing education. ACHRN holders typically work in program leadership, clinical education, or high-complexity settings.
What does a hyperbaric nurse earn?
The national average for hyperbaric nurses is approximately $95,000–$102,000 annually. CHRN certification adds a meaningful premium over non-certified RNs in the same setting. Setting matters significantly: military and VA facilities typically pay above private outpatient averages, while freestanding outpatient clinics may pay closer to the regional RN median. See the full hyperbaric nurse salary guide for state-by-state data and a breakdown by experience level.
Can new graduate nurses work in hyperbaric nursing?
No. CHRN eligibility requires a minimum of two years of hospital or hospital-based clinical experience (or one year of critical care nursing) before the hyperbaric portion of training begins. New graduates are not eligible and would not be competitive for hyperbaric positions even at facilities that do not formally require CHRN at hire.
What are the physical requirements for hyperbaric nursing?
Most hyperbaric roles are not physically strenuous in the same way that floor nursing is — patient lifting and repositioning is less frequent. The environment-specific requirements are comfort with enclosed spaces (particularly for nurses working alongside monoplace chambers for extended periods) and ear equalization tolerance for any nurses who pressurize in multiplace chambers. Some programs screen for claustrophobia specifically.
What professional organizations support hyperbaric nurses?
The Baromedical Nurses Association (BNA) is the primary professional organization for hyperbaric nurses, maintaining the certification board (BNACB) and providing continuing education and networking. The Undersea and Hyperbaric Medical Society (UHMS) is the broader multidisciplinary organization for the field, accrediting hyperbaric facilities and setting clinical treatment standards. UHMS membership provides a discount on CHRN exam fees.