- What COHN Means in Full
- Who Awards the Credential and How It Is Delivered
- What a COHN Actually Does
- How the Exam Is Built Around the Three Domains
- Eligibility: What the Letters Say About Your Experience
- The Fee Mechanics Behind the Letters
- What "Passing" Means for This Credential
- Keeping the Letters: Five-Year Recertification
- Where Credentialed Occupational Health Nurses Work
- Mapping Your Prep to the Domain Weights
- Frequently Asked Questions
- COHN stands for Certified Occupational Health Nurse, awarded by the American Board for Occupational Health Nurses, Inc. (ABOHN).
- The exam has 160 multiple-choice questions: 135 scored and 25 pretest, completed in 3 hours.
- Eligibility requires an RN license (or international equivalent) plus 3000 occupational-health practice hours in the previous five years.
- Scored items split 72/40/23 across Clinical Practice and Case Management, Risk and Compliance, and Program Management and Quality Assurance.
What COHN Means in Full
COHN stands for Certified Occupational Health Nurse. It is a professional credential for registered nurses whose practice centers on the health, safety, and well-being of working people. The letters appear after a nurse's name and signal that an independent certifying board has verified both the nurse's occupational-health experience and their command of the specialty's knowledge base.
On this site, the acronym refers only to that nursing credential. If you are researching the topic from scratch, our companion pieces on what COHN is, what COHN stands for, and what COHN certification involves cover the same ground from slightly different angles. This article focuses on the practical meaning behind the letters: what they certify, what they require, and what they say to employers.
Who Awards the Credential and How It Is Delivered
The credential is governed by the American Board for Occupational Health Nurses, Inc. (ABOHN). The board sets eligibility rules, publishes the candidate handbook, defines the exam content outline, and manages recertification. Exam administration is handled by Assessment Systems Corporation (ASC), which delivers the test either at a testing center or through MonitorEDU live remote proctoring, so candidates can choose the setting that suits them.
The current candidate handbook is dated March 2026, and it is the document to treat as authoritative whenever a blog post, forum thread, or colleague's memory disagrees with what you read elsewhere. Details such as fee amounts, hour requirements, and scored-item allocations come from that handbook and from ABOHN's published pages, and policies can change between handbook editions.
What a COHN Actually Does
Occupational health nursing differs from bedside or clinic nursing in one fundamental way: the "patient" is often a workforce, and the setting is a workplace. A COHN may treat an individual employee with an injury, but is just as likely to be analyzing injury trends, advising on compliance obligations, or designing a wellness program for an entire facility.
The three exam domains mirror this reality. They are not arbitrary academic categories; they describe the three hats an occupational health nurse wears:
Clinical Practice and Case Management
The hands-on and care-coordination side of the role, and the largest domain on the exam.
- Assessing and managing work-related injuries and illnesses
- Coordinating return-to-work and modified-duty planning
- Managing cases that span workers' compensation, disability, and medical providers
- Evaluating fitness for duty and conducting health surveillance
Risk and Compliance
The regulatory and hazard-focused side of practice.
- Recognizing and evaluating workplace hazards and exposures
- Applying occupational safety and health regulations and recordkeeping rules
- Supporting medical surveillance tied to specific exposures
- Protecting confidentiality while meeting reporting obligations
Program Management and Quality Assurance
The organizational and leadership side of practice.
- Planning, implementing, and evaluating health and safety programs
- Using data and outcomes to measure program effectiveness
- Managing resources, budgets, and stakeholder relationships
- Driving continuous quality improvement
For a deeper breakdown of how each area is tested, see our complete guide to the COHN exam domains.
How the Exam Is Built Around the Three Domains
The exam consists of 160 multiple-choice questions delivered over 3 hours. Of those, 135 are scored and 25 are pretest items that are being evaluated for future exams and do not count toward your result. You will not be told which questions are pretest, so every item deserves your full effort. The exam is closed-book.
ABOHN's official allocation of scored items is expressed as item counts, not percentage labels. The three listed domains carry 72, 40, and 23 scored items respectively:
| Domain | Scored Items | What It Emphasizes |
|---|---|---|
| Clinical Practice and Case Management | 72 | Injury and illness management, case coordination, return to work |
| Risk and Compliance | 40 | Hazard recognition, regulations, surveillance, confidentiality |
| Program Management and Quality Assurance | 23 | Program planning, evaluation, data use, quality improvement |
The practical takeaway: Clinical Practice and Case Management accounts for the largest share of what you are scored on. A candidate who is strong in the clinical domain but neglects program management can still do well, though ignoring any domain entirely is risky because the pretest items are mixed in and unlabeled.
Key Takeaway
Because 25 of the 160 questions are unscored pretest items, you cannot identify and skip them. Treat every question as scored, and do not let one unfamiliar item rattle you for the rest of the exam.
Questions tend to be scenario-driven: a worker presents with a situation, a workplace exposure is described, or a program problem is outlined, and you choose the best response. Expect to apply judgment, not just recall definitions. For a candid view of how this feels in practice, read how hard the COHN exam is.
Eligibility: What the Letters Say About Your Experience
The COHN is an experience-verified credential. To sit for the exam, you need:
- A current registered nurse license, or an international equivalent
- 3000 hours of occupational-health practice within the previous five years
The handbook also describes specified education alternatives to the practice-hour requirement, and those alternatives require ABOHN approval. If you are considering that route, confirm the details directly in the handbook before you plan your timeline. Our COHN requirements guide walks through the eligibility path step by step.
This is what gives the credential weight with employers. The letters tell a hiring manager that the nurse has real, recent time in occupational-health roles and has also passed a standardized assessment of the specialty.
The Fee Mechanics Behind the Letters
Initial certification involves two charges:
| Fee | Amount |
|---|---|
| Application fee | $150 |
| Examination fee | $400 |
| Total | $550 |
Budget separately for study materials, practice testing, and any time off for the exam itself. If your employer offers professional development funding, ask whether certification costs qualify. For a fuller picture of what the credential costs over time, see our COHN certification cost breakdown, and for scheduling logistics, check COHN exam dates and testing windows.
What "Passing" Means for This Credential
The exam uses an Angoff-based passing standard. In plain terms, a panel of qualified subject-matter experts judges how a minimally competent occupational health nurse would perform on each item, and those judgments are used to set the cut score. The goal is to measure competence against a defined standard, not to rank candidates against one another.
The takeaway for candidates is simple: do not rely on a rumored cut score or pass percentage to calibrate your preparation. Aim for solid competence across all three domains.
Keeping the Letters: Five-Year Recertification
Earning the COHN is not a one-time event. The credential runs on a five-year recertification cycle. To recertify, you must maintain:
- Active RN status
- 3000 hours of practice
- 50 related continuing nursing education (CNE) hours
ABOHN also lists an annual maintenance/recertification fee of $150. Because the cycle is long, it pays to track your CNE activities and practice hours as you go instead of reconstructing them in year five. Candidates comparing certification against its long-term obligations should also read our analysis of whether the COHN is worth it.
Where Credentialed Occupational Health Nurses Work
The title tells you the specialty, but not the employer. Occupational health nurses work wherever employers have a stake in workforce health, which is a remarkably wide range:
- Manufacturing and industrial plants, where injury management and exposure surveillance are daily concerns
- Hospitals and health systems, running employee health departments
- Corporate offices, focused on wellness, ergonomics, and absence management
- Construction, utilities, and energy companies, with high-hazard work and strict compliance demands
- Government agencies and public employers, managing large workforces with defined programs
- Consulting and third-party occupational health providers, serving multiple client employers
The credential helps most in roles that blend clinical judgment with compliance and program responsibility, which is exactly the combination the three exam domains describe. Browse our overview of COHN jobs for more on roles and settings, and the COHN salary guide for how compensation is typically discussed.
Mapping Your Prep to the Domain Weights
Since this article is about what the credential means, one short note on preparation: let the scored-item allocation drive your calendar. Clinical Practice and Case Management earns the most scored items, so it deserves the most time. Here is one way to sequence it:
Clinical Practice and Case Management
- Start here because it is the largest domain and builds vocabulary used elsewhere
- Work through injury and illness scenarios and return-to-work reasoning
Risk and Compliance
- Review hazard categories, exposure surveillance, and recordkeeping logic
- Practice questions where regulation and confidentiality interact
Program Management and Quality Assurance
- Cover program planning, outcome measurement, and quality improvement
- Finish with mixed-domain practice under timed conditions
For a complete plan, see our COHN study guide, and keep the COHN cheat sheet handy for last-week review. When you are ready to test yourself, our COHN practice tests mirror the scenario-based style you will face, and you can start practicing here at any point in your preparation. If training options are on your mind, our page on COHN training covers the landscape.
Frequently Asked Questions
COHN stands for Certified Occupational Health Nurse. It is a credential awarded by the American Board for Occupational Health Nurses, Inc. (ABOHN) to registered nurses who meet the board's practice-hour requirements and pass its certification exam.
The exam has 160 multiple-choice questions, of which 135 are scored and 25 are unscored pretest items. Candidates have 3 hours, and the exam is closed-book. It is offered at a testing center or through MonitorEDU live remote delivery.
You need an RN license (or international equivalent) and 3000 occupational-health practice hours within the previous five years. The handbook lists specified education alternatives, but those require ABOHN approval, so check the March 2026 handbook before relying on one.
Initial certification totals $550: a $150 application fee plus a $400 examination fee. Recertification on the five-year cycle requires active RN status, 3000 practice hours, and 50 related CNE hours, and ABOHN lists a $150 annual maintenance/recertification fee.
Clinical Practice and Case Management, with 72 of the 135 scored items. Risk and Compliance follows with 40, and Program Management and Quality Assurance has 23. These are official item counts, not percentage labels.