How Hard Is the COHN?
Pass Rates, Difficulty Factors, and What to Expect
The ABOHN COHN (Certified Occupational Health Nurse) exam validates proficiency in occupational health nursing practice.
Exam Format
- •Total Questions: 160 (135 scored + 25 pretest)
- •Time Limit: 3 hours
- •Eligibility: RN + 3,000 hours OHN experience
What Makes the COHN Challenging?
1. Regulatory Knowledge
The exam tests OSHA regulations, EPA standards, ADA requirements, and workers’ compensation law. This regulatory content is unique to occupational health and requires dedicated study.
2. Industrial Hygiene Concepts
Understanding chemical exposure limits (PELs, TLVs), noise dosimetry, ventilation, and hazard assessment requires technical knowledge beyond typical nursing education.
3. Case Management Complexity
Workers’ compensation case management involves navigating legal, medical, and employment considerations simultaneously — a complex skill set.
4. Practice Analysis-Based Content
The exam is based on a periodic practice analysis of OHNs nationwide, ensuring it reflects current practice. Content may include topics you don’t encounter in your specific workplace.
Frequently Asked Questions
What is the pass rate for the COHN?
ABOHN does not publish pass rates publicly. Anecdotally, experienced OHNs who prepare adequately report good first-time pass rates.
How should I prepare for the COHN?
Review the ABOHN Candidate Handbook and Test Blueprint. Study OSHA standards, workers’ compensation law, and industrial hygiene fundamentals. Take the COHN Self-Assessment Test (CSAT) available from ABOHN.
Is the COHN recognized by employers?
Yes. The COHN is the gold standard certification for occupational health nurses. Many employers prefer or require OHN certification for occupational health positions.
Frequently Asked Questions
What is the COHN exam?
The COHN is a standardized exam. For a comprehensive study guide with practice questions and full-length exams, see our COHN Study Guide.
How should I prepare for the COHN?
Start with a structured study plan, use official exam blueprints, and practice with realistic exam questions. Our COHN Study Guide covers the complete exam content with detailed rationales.
Where can I find COHN practice questions?
Our COHN Study Guide includes full-length practice exams with detailed answer rationales covering every content area on the actual exam.
Related Resources
Ready to Take the Next Step?
Our COHN Study Guide covers every content area with practice questions and detailed answer rationales.