COHN vs COHN-S: Which Occupational Health Certification Is Right for You?
Comparing the Certified Occupational Health Nurse and Specialist Credentials
ABOHN (American Board of Occupational Health Nursing) offers two certifications for occupational health nurses: the COHN and the COHN-S. The right choice depends on your education, role, and scope of practice.
What Is the COHN?
The COHN (Certified Occupational Health Nurse) validates competence in occupational health nursing practice at the proficient level. It’s designed for RNs providing direct occupational health services.
- •Certifying Body: ABOHN
- •Questions: 160 (135 scored + 25 pretest)
- •Time Limit: 3 hours
- •Eligibility: RN license + 3,000 hours OHN experience in 5 years
- •Education: RN (no specific degree requirement)
What Is the COHN-S?
The COHN-S (Certified Occupational Health Nurse-Specialist) validates expertise at a broader, more strategic level — including management, program development, and policy implementation.
- •Certifying Body: ABOHN
- •Questions: 160 (135 scored + 25 pretest)
- •Time Limit: 3 hours
- •Eligibility: Bachelor’s degree + RN license + 3,000 hours OHN experience in 5 years
- •Education: BSN or higher required
Key Differences
Which Should You Choose?
Choose the COHN if you:
- •Provide direct occupational health care
- •Focus on case management, health surveillance, and injury treatment
- •Don’t hold a bachelor’s degree (or your degree isn’t in nursing/health)
- •Want to validate your clinical OHN expertise
Choose the COHN-S if you:
- •Hold a bachelor’s degree or higher
- •Manage occupational health programs
- •Develop policies, budgets, and strategic initiatives
- •Want to demonstrate advanced OHN leadership
Important Note
ABOHN emphasizes: choose the exam that fits your practice, not your education level. Having a higher degree doesn’t mean you should take the COHN-S if your role is primarily clinical.
Frequently Asked Questions
Can I take both the COHN and COHN-S?
Yes, but you must choose one to take first. If you qualify for both, ABOHN recommends selecting the exam that best matches your current practice role.
What if my degree isn’t in nursing?
For the COHN-S, ABOHN accepts a bachelor’s degree in any field — it doesn’t have to be a BSN. For the COHN, no specific degree beyond RN licensure is required.
How long is the COHN/COHN-S certification valid?
Both certifications are valid for 5 years. Recertification requires annual renewal fees and recertification every 5 years with continuing education.
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.