- ACHRN is an advancement from CHRN, not a separate written exam.
- You need three years of CHRN certification before applying to advance.
- Applicants must log 480 hyperbaric hours in the prior 12 months, verified by a manager or medical director.
- Submit 60 CE hours from the last four years, with at least 30 Category A hours in hyperbaric oxygen therapy.
ACHRN In One Line
The Advanced Certified Hyperbaric Registered Nurse (ACHRN) credential is issued by the Baromedical Nurses Association Certification Board (BNACB) and administered through the National Board of Diving and Hyperbaric Medical Technology (NBDHMT). It is not a standalone test you sit for in a testing center. It is a documented advancement from an active CHRN credential, built on years of hyperbaric practice, continuing education, and professional contribution. If you're searching for an "ACHRN exam" with its own question bank, that search is pointing you at the wrong idea - the actual exam pressure lives entirely inside the CHRN prerequisite. For a full explanation of the terminology and how it differs from other things people assume it means, see What Is ACHRN? and ACHRN Meaning.
The Advancement Pathway at a Glance
Think of the pathway as three stages stacked on top of each other: earn CHRN, accumulate qualifying experience and education while holding CHRN, then submit the advancement/recertification form to move up to ACHRN. There is no interview, no proctored ACHRN test, and no separate content domains to memorize beyond what CHRN already covers.
- Stage 1: Pass the CHRN exam and hold the credential.
- Stage 2: Practice for at least three years as a CHRN, logging hyperbaric hours and CE credit.
- Stage 3: Submit the advancement/recertification form with verified hours, CE documentation, and contribution evidence.
Because Stage 2 is measured in years, not weeks, most of your "prep" for ACHRN is really career planning - scheduling shifts, saving certificates, and lining up verification signatures well before you ever open an application form. A deeper walkthrough of each qualifying step lives in ACHRN Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Eligibility Checklist
Before you submit anything, confirm each of these boxes is checked. The August 2025 advancement/recertification form is specific about what it wants to see, and missing any single item stalls the entire application.
Baseline Status Requirements
These are non-negotiable prerequisites the form checks first.
- Current, active CHRN certification
- Valid, unrestricted RN license
- At least three years of documented hyperbaric experience
- At least 480 hyperbaric hours in the preceding 12 months, verified by a manager or medical director
Education and Contribution Requirements
These prove ongoing professional development beyond bedside hours alone.
- 60 continuing education hours from the preceding four years
- At least 30 of those hours must be Category A, specific to hyperbaric oxygen therapy
- Documented activity in at least two of the four contribution categories
Continuing Education Math
The CE requirement is where a lot of otherwise-qualified nurses get tripped up, because the math has two layers rather than one flat number. You need 60 total CE hours earned within the preceding four years - but at least half of that total, 30 hours, has to be Category A hyperbaric oxygen therapy content specifically. Generic nursing CE, even good CE, does not automatically satisfy the Category A portion.
Key Takeaway
Track CE hours in two separate columns from day one of your CHRN certification: a running total column and a "Category A hyperbaric-specific" column. Reconciling four years of scattered certificates at the last minute is the single most avoidable delay in advancement applications.
Continuing education planning also intersects with exam readiness if you're still working toward CHRN itself. If you haven't yet passed the prerequisite exam, focus your study time there first - see ACHRN Study Guide 2026: How to Pass on Your First Attempt for a structured approach before you even start the CE clock.
Contribution Categories
Beyond hours and CE, the advancement form asks you to document meaningful involvement in the hyperbaric field itself. You need evidence in at least two of the following four categories.
1. Hyperbaric Unit Administration
Managing schedules, policies, safety protocols, or day-to-day operations of a hyperbaric program counts here. Keep memos, org charts, or role descriptions that show administrative responsibility.
2. Teaching or Presenting Hyperbaric Lectures
Formal in-service education, conference presentations, or structured staff training on hyperbaric topics qualifies. Save agendas, slide decks, or attendance sign-in sheets as proof.
3. Nursing-Care Planning or Coordination
Primary responsibility for building or coordinating individualized hyperbaric nursing-care plans is one of the most common categories nurses already satisfy without realizing it. Document your role explicitly in writing from a supervisor.
4. BNA/UHMS Officer or Committee Participation
Serving as an officer or committee member within the Baromedical Nurses Association or the Undersea and Hyperbaric Medical Society counts toward this category. Meeting minutes and appointment letters serve as documentation.
Fees and the Four-Year Renewal Cycle
Advancement/recertification fees are tiered by membership status. Knowing your tier before you submit avoids payment delays.
| Applicant Type | Fee (USD) |
|---|---|
| BNA member | $150 |
| UHMS or ACHM member | $200 |
| Nonmember | $250 |
Once advanced, ACHRN status renews every four years, and renewal requires maintaining the same advanced-level requirements - active RN licensure, ongoing hyperbaric hours, and updated supporting documentation. It is not a passive credential that stays valid without upkeep. For a full cost breakdown across the entire pathway, from CHRN exam fees through advancement and renewal, read ACHRN Certification Cost 2026: Complete Pricing Breakdown.
CHRN Prerequisite Exam Snapshot
Since ACHRN itself has no written exam, all of your test-day preparation energy belongs to the CHRN exam that must come first. Here is the format in brief:
- Format: 120 questions, mixing multiple-choice and true/false items
- Time limit: Two hours
- Passing score: 70%
If you're still deciding how much runway to give yourself before test day, review How Hard Is the ACHRN Exam? Complete Difficulty Guide 2026 and the passing-score breakdown in ACHRN Passing Score 2026: Exactly What You Need to Pass. You can also check current windows in ACHRN Exam Dates 2026: Testing Windows, Deadlines & Scheduling, and practice with realistic timed sets on our CHRN practice test platform before you register.
One-Week Application Sprint
Once you've met the three-year, CE, and contribution thresholds, the actual paperwork can usually be assembled in about a week if you batch tasks by day instead of tackling everything at once.
Gather Verification Documents
- Confirm active CHRN status and current RN license copy
- Request manager or medical-director sign-off on the 480-hour verification
Reconcile CE Records
- Total all CE hours from the preceding four years
- Separate and confirm at least 30 Category A hyperbaric oxygen therapy hours
Assemble Contribution Evidence
- Select two qualifying contribution categories
- Collect supporting letters, agendas, or meeting records
Submit and Pay
- Double-check membership tier for correct fee amount
- Submit the completed advancement/recertification form
This sprint approach works because the heavy lifting - the three years of experience and CE accumulation - already happened in the background. The sprint is about documentation, not new learning.
Who Hires ACHRNs
Hospitals and wound-care centers operating multiplace or monoplace hyperbaric chambers tend to value ACHRN status when filling senior nursing roles, charge-nurse positions, or program-coordinator openings. Because the advancement itself proves administrative involvement, teaching activity, or care-coordination leadership, employers often view it as a signal of readiness for supervisory hyperbaric responsibilities rather than purely bedside work. If you're weighing whether the advancement is worth pursuing for your career trajectory, compare the practical upside in Is the ACHRN Certification Worth It? Complete ROI Analysis 2026 and browse current openings context in ACHRN Jobs.
Common Paperwork Mistakes
- Applying before three full years of CHRN certification. The clock starts at CHRN certification, not at first hyperbaric shift.
- Miscounting the 480-hour window. The hours must fall within the 12 months immediately preceding the application, not any 12-month stretch.
- Mixing general CE with Category A hyperbaric CE. Only hyperbaric-specific Category A hours count toward the 30-hour minimum inside the 60-hour total.
- Documenting only one contribution category. The form requires at least two, so plan early for a second qualifying activity if needed.
- Paying the wrong fee tier. Nonmember, UHMS/ACHM, and BNA member rates differ, and mismatched payments can delay processing.
For a broader look at how these requirements fit together across the whole certification lifecycle, see ACHRN Certification and What Is ACHRN Certification?. And if you're brand new to hyperbaric nursing and still mapping out the CHRN-to-ACHRN journey from scratch, start with ACHRN Training and practice CHRN-style questions on our practice exam site to build exam-day confidence before you worry about advancement paperwork at all.
FAQ
No. ACHRN is an advancement from CHRN based on documented experience, continuing education, and professional contribution. The only proctored exam in this pathway is the CHRN exam.
The resource manual permits an advancement application after three years of holding CHRN certification, alongside meeting the hours, CE, and contribution requirements.
At least 480 hyperbaric hours in the preceding 12 months, verified by a manager or medical director on the advancement/recertification form.
You need 60 total CE hours from the preceding four years, including at least 30 Category A hours specifically in hyperbaric oxygen therapy.
Renewal occurs every four years, and it requires maintaining the advanced-level requirements along with active RN licensure and updated documentation.