- What "Passing Score" Means on the COHN
- How the Exam Is Built: 160 Items, 135 Scored
- The Angoff Standard Explained
- The 65% vs. 57/85 Discrepancy
- Where Your Scored Items Come From
- Building a Study Plan Around the Passing Standard
- Fees, Delivery, and Test-Day Mechanics
- After You Pass: Keeping the Credential
- Frequently Asked Questions
- The COHN has 160 multiple-choice questions: 135 are scored and 25 are unscored pretest items, over 3 hours.
- ABOHN uses an Angoff-based passing standard, so there is no fixed "70%" rule you can assume.
- ABOHN reports 65% for 2025 but also lists 57/85, an unresolved discrepancy worth confirming directly.
- Scored items split 72/40/23 across the three domains; Clinical Practice and Case Management is largest.
What "Passing Score" Means on the COHN
Candidates searching for the Certified Occupational Health Nurse passing score usually want a single clean number: "I need X percent to pass." The honest answer is more nuanced, and understanding that nuance is the first step toward preparing intelligently. The Certified Occupational Health Nurse examination, administered by the American Board for Occupational Health Nurses, Inc. (ABOHN), is scored against a criterion-referenced passing standard rather than a simple classroom-style percentage cutoff.
That distinction matters. In a classroom, a teacher might declare that 70% earns a pass. A professional certification exam works differently: a panel of subject-matter experts decides what level of knowledge a minimally competent occupational health nurse should demonstrate, and the passing standard is set to reflect that judgment. Your result is measured against competence, not against how well other candidates happened to perform on exam day.
If you are still deciding whether the credential fits your career, our complete ROI analysis of the COHN certification walks through the professional case, and you can see the broader eligibility picture in COHN Requirements 2026.
How the Exam Is Built: 160 Items, 135 Scored
Before you can reason about a passing score, you need to understand what is actually being scored. The COHN exam contains 160 multiple-choice questions, but only 135 of them count toward your result. The remaining 25 are pretest items: questions ABOHN is trying out for possible future use. They are mixed in with the scored questions, and candidates are not told which is which.
| Exam Feature | COHN Detail |
|---|---|
| Total questions | 160 multiple-choice |
| Scored questions | 135 |
| Unscored pretest questions | 25 |
| Time allowed | 3 hours |
| Reference materials | Closed-book |
| Delivery | Assessment Systems Corporation (ASC): test center or MonitorEDU live remote |
| Fees | $150 application + $400 examination = $550 |
The practical consequence of the pretest design is psychological as much as strategic. When you hit a question that feels unfamiliar, off-topic, or oddly worded, there is a real chance it is one of the 25 unscored items. You cannot identify them, so you must answer every question seriously, but you can avoid spiraling when a single item feels impossible. One hard question rarely decides the outcome.
Three hours for 160 items works out to a little over a minute per question. That pace is manageable for a prepared nurse, but it rewards decisive reading of case-based stems. For a deeper look at how demanding the exam feels in practice, see How Hard Is the COHN Exam?
The Angoff Standard Explained
ABOHN's passing standard is Angoff-based. The Angoff method is one of the most widely used standard-setting approaches in professional credentialing. In its general form, a panel of experts reviews each exam question and estimates the probability that a minimally competent candidate would answer it correctly. Those estimates are aggregated across items to produce the passing standard for that exam form.
What the Angoff approach means for candidates
- The standard reflects competence, not competition. You are not graded on a curve against the other people testing that week.
- Harder forms and easier forms are treated fairly. If one version of the exam contains tougher items, the standard-setting process is designed to account for that rather than penalize you for drawing it.
- The cut point is not something you can reverse-engineer from a single published percentage. A raw number of correct answers needed can differ from the headline percentage depending on how the standard is expressed.
Key Takeaway
Think of the passing score as a competence line, not a grade. Aim for consistent, confident performance in every domain rather than gambling on being strong in one area and weak in another.
The 65% vs. 57/85 Discrepancy
This is where candidates deserve transparency. ABOHN's certification statistics page reports a passing figure of 65% for 2025, but the same published material also lists 57/85 in connection with the passing standard. These two figures do not obviously reconcile, and the discrepancy is unresolved in the public sources.
There are a few reasonable ways to think about a mismatch like this, though none can be confirmed from the published materials:
- The two figures may be expressed on different scales or tied to different exam forms or reporting years.
- One figure may describe a percentage of correct answers while the other describes a raw count against a subset of items.
- One may simply be outdated or mislabeled on the statistics page.
Rather than guess, treat both numbers as unconfirmed and do two things. First, read the current ABOHN handbook (the March 2026 edition is the reference for this article) for the official explanation of how results are reported. Second, if the discrepancy affects your planning, contact ABOHN directly and ask how the passing standard is expressed for the form you will take.
For more on what has and has not been published about outcomes, read COHN Pass Rate 2026: What the Data Shows.
Where Your Scored Items Come From
The official allocation of scored items across the three content areas is 72 / 40 / 23. Note the important detail: these are item counts, not percentage labels. Added together they equal 135, which matches the number of scored questions on the exam. Clinical Practice and Case Management is the largest domain.
| Domain | Scored Items | Relative Emphasis |
|---|---|---|
| Domain 1: Clinical Practice and Case Management | 72 | Largest by a wide margin |
| Domain 2: Risk and Compliance | 40 | Second largest |
| Domain 3: Program Management and Quality Assurance | 23 | Smallest, but still decisive near the cut |
Because Domain 1 supplies more than half of all scored questions, it is the single most important place to build reliable knowledge. But do not dismiss Domain 3. With only 23 items, a shaky showing there can cost you several points, and those points matter if your Domain 1 and Domain 2 performance is only borderline.
Domain 1: Clinical Practice and Case Management (72 items)
This is the core of occupational health nursing practice: assessing and managing worker health in the context of the job.
- Work-related injury and illness assessment, triage, and treatment planning
- Case management of occupational injuries, including return-to-work and modified-duty coordination
- Health surveillance and medical monitoring tied to workplace exposures
- Health promotion and the interaction between work demands and worker health
Domain 2: Risk and Compliance (40 items)
This domain tests your ability to identify hazards and apply the regulatory framework that governs worker safety and health.
- Hazard recognition, exposure assessment, and the hierarchy of controls
- Occupational safety and health regulations and recordkeeping obligations
- Workers' compensation concepts and related legal requirements
- Confidentiality and ethical handling of employee health information
Domain 3: Program Management and Quality Assurance (23 items)
This domain looks at the occupational health nurse as a program leader and evaluator.
- Planning, budgeting, and managing an occupational health service
- Measuring program outcomes and using data for quality improvement
- Policy development and communication with employers, managers, and workers
- Evidence-based practice and program evaluation
For the full breakdown of each content area and how questions are framed, see COHN Exam Domains 2026: Complete Guide to All 3 Content Areas.
Building a Study Plan Around the Passing Standard
Since the scoring structure is known even if the exact cut number is murky, your study plan should be weighted by item counts and by your own weak spots. The following timeline allocates effort in proportion to the 72/40/23 split while reserving time to simulate the closed-book, three-hour conditions of the real exam. This is the only generic-style planning section in this article, and it is tied directly to the COHN's structure.
Domain 1 foundation
- Spend the largest block of time on Clinical Practice and Case Management, since 72 of 135 scored items live here
- Practice case-based questions on injury management and return-to-work decisions
- Review surveillance and exposure-related clinical reasoning
Domain 2 regulations and risk
- Work through hazard control, recordkeeping, and workers' compensation scenarios
- Drill the compliance concepts that you must recall without reference materials
Domain 3 program management
- Cover program planning, outcomes measurement, and quality assurance
- Do not skip this domain: 23 items can decide a borderline result
Timed, mixed practice
- Take full-length timed sets mirroring 160 items in 3 hours
- Review every miss by domain and revisit your weakest area first
Because the exam is closed-book, passive rereading is a weak strategy. Prioritize retrieval: answering questions, then explaining to yourself why each wrong option is wrong. Our COHN Study Guide 2026 expands this into a complete first-attempt plan, and our COHN cheat sheet condenses the must-know facts for last-week review. To test yourself under realistic conditions, use the COHN practice test.
How to use practice scores wisely
- Track results by domain, not just overall. A strong overall score can hide a weak Domain 3.
- Treat a single bad session as data, not a verdict.
- Aim for stable performance across several timed sets before you schedule your attempt.
- Remember that practice-test percentages are not predictions of the official cut point, which depends on ABOHN's Angoff-based standard for your exam form.
Fees, Delivery, and Test-Day Mechanics
The passing score is only one piece of the process. You also need to qualify and register before you can sit for the exam. Eligibility requires an RN license or international equivalent plus 3,000 hours of occupational-health practice within the previous five years; certain education alternatives are possible but require approval. The full details are in COHN Requirements 2026.
| Cost Item | Amount |
|---|---|
| Application fee | $150 |
| Examination fee | $400 |
| Total to test | $550 |
Testing is delivered through Assessment Systems Corporation (ASC), either at a testing center or through MonitorEDU live remote proctoring. Because the exam is closed-book, expect strict rules about what you may have at your workspace, and test your technology and environment ahead of time if you choose remote delivery. For a full pricing picture, see COHN Certification Cost 2026, and for scheduling windows, see COHN Exam Dates 2026.
After You Pass: Keeping the Credential
Earning the COHN is not a one-time event. Certification runs on a five-year recertification cycle. To recertify you must maintain active RN status, document 3,000 practice hours, and complete 50 related continuing nursing education (CNE) hours. An annual maintenance/recertification fee of $150 also applies. Knowing this up front helps you see the credential as an ongoing professional commitment rather than a single exam hurdle.
Employers that value the credential include occupational health clinics, corporate and industrial employee health programs, and organizations with significant workplace safety and compliance responsibilities. If you are weighing career outcomes, explore COHN jobs and the COHN salary guide for realistic expectations.
Frequently Asked Questions
ABOHN uses an Angoff-based passing standard rather than a fixed classroom-style cutoff. ABOHN reports 65% for 2025 but also lists 57/85, and that discrepancy is unresolved in the published materials. Confirm the current expression of the standard in the March 2026 handbook or with ABOHN directly.
Of the 160 multiple-choice questions, 135 are scored and 25 are unscored pretest items. You cannot tell which are which, so answer every question carefully.
Clinical Practice and Case Management is the largest. The official scored-item allocation is 72 items for Domain 1, 40 for Risk and Compliance, and 23 for Program Management and Quality Assurance, totaling 135 scored items.
No. The COHN is a closed-book exam. This applies whether you test at a center or through MonitorEDU live remote proctoring delivered by ASC.
The total is $550: a $150 application fee plus a $400 examination fee. After certification, an annual maintenance/recertification fee of $150 applies, with a five-year recertification requiring active RN status, 3,000 practice hours, and 50 related CNE hours.
Ready to measure your readiness against the real exam format? Start with realistic questions on our COHN practice test site, and review the COHN certification overview to confirm you understand the full pathway from eligibility to recertification.