- The Short Answer: What COHN Means
- Who Awards the Credential
- What a Certified Occupational Health Nurse Actually Does
- What the Exam Tests: Three Domains
- Exam Format and Delivery
- Eligibility and Fee Mechanics
- How the Passing Standard Works
- Where Certified Occupational Health Nurses Work
- Keeping the Credential Current
- Planning Your Preparation Around the Domains
- Frequently Asked Questions
- COHN stands for Certified Occupational Health Nurse, a credential awarded by the American Board for Occupational Health Nurses, Inc.
- The exam has 160 multiple-choice questions, 135 scored and 25 pretest, in a three-hour closed-book sitting.
- Candidates need an RN license (or international equivalent) plus 3000 occupational-health practice hours in the previous five years.
- Total cost is $550: a $150 application fee plus a $400 examination fee.
The Short Answer: What COHN Means
COHN stands for Certified Occupational Health Nurse. It is a professional certification for registered nurses whose practice centers on the health, safety, and well-being of workers and working populations. Holding the credential signals that a nurse has documented substantial occupational-health experience and has passed a standardized, board-administered examination covering the specialty.
On this site, and throughout this article, COHN refers only to that nursing credential. If you landed here while researching the letters themselves, our related explainers cover the same ground from different angles: What Does COHN Stand For?, COHN Meaning, and What Is A COHN? all address the terminology, while this guide goes further into what the credential involves in practice.
Who Awards the Credential
The Certified Occupational Health Nurse credential is awarded by the American Board for Occupational Health Nurses, Inc. (ABOHN). ABOHN sets the eligibility criteria, defines the content outline, publishes the candidate handbook, and maintains the certification once earned. The current handbook is dated March 2026, and candidates should treat it as the controlling document for any rule that appears differently elsewhere.
Exam delivery runs through Assessment Systems Corporation (ASC). Candidates can test at a testing center or take the exam through live remote delivery using MonitorEDU. That means a qualified nurse in a rural area can sit for the exam without traveling, provided their testing environment meets the proctoring requirements.
For a broader orientation to the credential itself, see COHN Certification and What Is COHN Certification?.
What a Certified Occupational Health Nurse Actually Does
Occupational health nursing differs from bedside or clinic nursing in one fundamental way: the patient is often a workforce, not just an individual. A COHN may treat an injured employee in the morning, review exposure data in the afternoon, and brief management on a program metric before the day ends.
Typical responsibilities
- Injury and illness management: assessing and treating work-related injuries, coordinating care, and managing return-to-work and modified-duty decisions.
- Case management: tracking workers' compensation cases, communicating with providers, employers, and payers, and guiding recovery timelines.
- Surveillance and screening: running medical surveillance programs tied to workplace hazards, from hearing conservation to respiratory protection programs.
- Regulatory compliance: keeping health programs aligned with workplace safety and health regulations and recordkeeping requirements.
- Health promotion and prevention: designing wellness, ergonomics, and injury-prevention initiatives for specific job populations.
- Program leadership: setting goals, measuring outcomes, managing budgets, and demonstrating the value of occupational health services.
This blend of clinical judgment, regulatory fluency, and business awareness is exactly what the examination is built to measure. If you are weighing where the credential can take you, COHN Jobs explores the roles in more detail.
What the Exam Tests: Three Domains
The examination is organized into three content domains. ABOHN's official scored-item allocation is expressed as item counts, not percentage labels: 72, 40, and 23 scored items across the domains, for 135 scored items in total. The remaining 25 questions on your exam are unscored pretest items, and you will not know which ones they are.
| Domain | Scored Items | Character of the Content |
|---|---|---|
| Domain 1: Clinical Practice and Case Management | 72 | Assessment, treatment, case coordination, return-to-work decisions |
| Domain 2: Risk and Compliance | 40 | Hazard recognition, regulatory requirements, surveillance, recordkeeping |
| Domain 3: Program Management and Quality Assurance | 23 | Program planning, outcomes measurement, quality improvement, leadership |
Domain 1: Clinical Practice and Case Management
This is the largest domain and the one most familiar to practicing nurses, but the occupational lens changes how questions are framed. Expect scenarios that ask you to weigh clinical findings against work demands, employer obligations, and recovery timelines.
- Assessing and managing work-related injuries and illnesses
- Coordinating cases across providers, employers, and payers
- Making return-to-work and modified-duty determinations
- Distinguishing work-related from non-work-related conditions
Domain 2: Risk and Compliance
This domain tests whether you can recognize workplace hazards, apply regulatory requirements, and structure surveillance so that exposures are caught early and documented correctly.
- Identifying physical, chemical, biological, and ergonomic hazards
- Applying workplace health and safety regulations to realistic situations
- Medical surveillance and screening program design
- Recordkeeping, reporting, and confidentiality obligations
Domain 3: Program Management and Quality Assurance
The smallest domain by item count, but it rewards candidates who think like program leaders rather than only clinicians.
- Planning, implementing, and evaluating occupational health programs
- Selecting and interpreting outcome measures
- Quality improvement and demonstrating program value
- Budgeting, resource management, and stakeholder communication
For a deeper walkthrough of each content area, read COHN Exam Domains 2026: Complete Guide to All 3 Content Areas.
Exam Format and Delivery
The exam is a closed-book, computer-based test of 160 multiple-choice questions completed in three hours. Of those 160 questions, 135 are scored and 25 are pretest items being evaluated for future exams. Because pretest questions are indistinguishable from scored ones, treat every question as though it counts.
- Question style: multiple choice, with scenario-driven stems that often ask for the best or most appropriate next action.
- Pacing: three hours across 160 questions leaves a little over a minute per item, so long scenario questions need disciplined time management.
- Reference materials: none. The exam is closed-book, so regulatory details and clinical thresholds must come from memory.
- Delivery: through ASC, either at a testing center or by live remote proctoring with MonitorEDU.
If you are wondering how demanding that format feels in practice, How Hard Is the COHN Exam? Complete Difficulty Guide 2026 covers it candidly, and our COHN practice tests let you rehearse the pacing under realistic conditions.
Eligibility and Fee Mechanics
Who can sit for the exam
Eligibility rests on two pillars: licensure and experience. You need a current RN license or an international equivalent, plus 3000 hours of occupational-health practice within the previous five years. The hours requirement is deliberate. ABOHN wants certified nurses to have genuinely worked in the specialty, not merely studied it.
Specified education alternatives exist for candidates who do not meet the standard practice-hours path, but these require approval from ABOHN. If you think you might qualify through an alternative route, confirm the details in the current handbook before you plan your timeline. The full breakdown is in COHN Requirements 2026: Eligibility, Prerequisites & How to Qualify.
What it costs
| Fee | Amount |
|---|---|
| Application fee | $150 |
| Examination fee | $400 |
| Total | $550 |
Budget separately for study materials and any practice exams. A detailed cost walk-through is available in COHN Certification Cost 2026: Complete Pricing Breakdown, and if you are asking whether the spend pays off, Is the COHN Certification Worth It? Complete ROI Analysis 2026 tackles the question directly.
How the Passing Standard Works
ABOHN uses an Angoff-based passing standard. In this method, subject-matter experts judge how a minimally competent candidate would perform on each item, and those judgments inform the cut score. The practical implication is that the standard reflects competence against a defined bar, not a fixed percentage chosen in advance.
One honest caveat: ABOHN's public statistics reporting is not perfectly clean. The board reports a 65% figure for 2025 but also lists 57 and 85 in its materials, and that discrepancy is unresolved. Rather than guess which number is authoritative, treat any single pass-rate figure with caution and consult the primary source. We unpack what is and is not known in COHN Pass Rate 2026: What the Data Shows and COHN Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Do not anchor your preparation to a single pass-rate number. Because the published statistics contain an unresolved discrepancy, aim for broad mastery across all three domains rather than a target percentage.
Where Certified Occupational Health Nurses Work
Occupational health nurses are employed wherever organizations need someone to protect and manage worker health. Common settings include:
- Manufacturing and industrial plants, where injury management and hazard surveillance are daily concerns.
- Healthcare systems, where employee health services protect the clinical workforce.
- Utilities, energy, and construction, with demanding physical and exposure risks.
- Corporate and office environments, where wellness programs, ergonomics, and absence management take center stage.
- Government and public-sector employers, including agencies with large and varied workforces.
- Occupational medicine clinics and consulting firms, serving multiple client employers.
Compensation varies widely by setting, region, and scope of responsibility, so any single figure can mislead. For a measured look at earning potential, see COHN Salary Guide 2026: Complete Earnings Analysis.
Keeping the Credential Current
Earning the credential is not a one-time event. Certification runs on a five-year recertification cycle, and maintaining it requires:
- Active RN status throughout the cycle
- 3000 hours of practice
- 50 related continuing nursing education (CNE) hours
- An annual maintenance/recertification fee of $150
Because the CNE hours must be related to the specialty, it pays to choose continuing education that reinforces your three exam domains instead of collecting credits at random. Doing so keeps you sharp for the work and simplifies recertification. For an overview of structured preparation options, see COHN Training.
Planning Your Preparation Around the Domains
The scored-item allocation should shape how you divide your time. Clinical Practice and Case Management carries 72 of 135 scored items, so it deserves the largest share of your calendar. But the smaller domains are not safe to skip: a candidate who is strong clinically but weak on regulation or program evaluation can still struggle.
Domain 1: Clinical Practice and Case Management
- Review work-related injury and illness management and return-to-work logic
- Practice case-coordination scenarios involving employers, providers, and payers
- Spend the most time here because it carries the heaviest weight
Domain 2: Risk and Compliance
- Memorize regulatory requirements, since the exam is closed-book
- Work through hazard-recognition and surveillance scenarios
- Review recordkeeping and confidentiality obligations
Domain 3 plus full-length practice
- Cover program planning, outcome measures, and quality improvement
- Take timed practice exams to test the three-hour, 160-question pace
- Revisit weak areas identified by your results
This sequence puts the heaviest domain first while your energy is highest, then moves to the memory-heavy regulatory material close enough to the exam that it stays fresh. For a fuller preparation framework, use the COHN Study Guide 2026: How to Pass on Your First Attempt, and keep the COHN Cheat Sheet 2026: One-Page Review of Must-Know Facts handy for last-week review. When you are ready to test yourself, start with a full-length set on the COHN Exam Prep practice site.
Frequently Asked Questions
COHN stands for Certified Occupational Health Nurse. It is a nursing credential awarded by the American Board for Occupational Health Nurses, Inc. to registered nurses who meet experience requirements and pass the certification exam.
The exam contains 160 multiple-choice questions, of which 135 are scored and 25 are unscored pretest items. You have three hours to finish, and the exam is closed-book.
You need an RN license or an international equivalent plus 3000 hours of occupational-health practice within the previous five years. Specified education alternatives exist but require approval, so check the current ABOHN handbook for details.
The application fee is $150 and the examination fee is $400, for a total of $550. Recertification maintenance carries a separate annual fee of $150.
Certification runs on a five-year cycle. To recertify, you need active RN status, 3000 practice hours, and 50 related CNE hours, along with the annual maintenance fee.