COHN-S Exam Study Guide 2026–2027 | Certified Occupational Health Nurse-Specialist Exam Prep | ABOHN Certification + Practice Tests

A complete study guide for the Certified Occupational Health Nurse–Specialist (COHN-S) exam from the American Board for Occupational Health Nurses (ABOHN), organized by the four domains of the current content outline.

What's Inside:

• Exam overview: 160-question format, timing, scoring, eligibility, fees, retakes, recertification and the official domain weights
• Content review in 4 sections and 39 topics: Clinical Practice and Case Management (standards of care, injury and illness care, infection control, documentation and confidentiality, fitness for duty, disability and leave, workers' compensation, return to work, provider evaluation); Risk and Compliance (job analysis, chemical, physical, biological and psychosocial hazards, ergonomics, hierarchy of controls and PPE, industrial hygiene, emergency and disaster planning, OSHA and legal compliance, medical surveillance, DOT drug and alcohol testing); Program Management and Quality Assurance (training, EAP, wellness, infection control programs, QI, program evaluation and metrics, epidemiology, audits and evidence-based practice); Operations and Business Management (scope of services, strategic planning, leadership, teams and change, staffing, safety culture, budgets and ROI, stakeholder reporting, information management)
• 2 practice tests with 200 exam-level questions weighted like the real exam (33 / 24 / 22 / 21 per test), with workplace scenarios and calculations (incidence rates, TWA, lifting index, ROI)
• Detailed answer explanations for every question
• 94 quick-reference tables plus chain-of-infection, hierarchy-of-controls and PDSA diagrams, process flows, study schedules, test-taking strategies and FAQs

Format:

• Digital PDF, instant download
• 162 printable US Letter pages

This is an independent study resource and is not affiliated with or endorsed by the American Board for Occupational Health Nurses (ABOHN).