Occupational health nurses protect workers from the hazards that come with their jobs. Rather than treating patients in a hospital, they assess workplace environments, prevent injuries before they happen, manage workers’ compensation cases, and ensure employers stay compliant with federal safety regulations. It is a specialty where clinical nursing skill meets public health thinking — and where work-life balance looks markedly different from the hospital floor.
Quick answer:
- Earn a BSN (preferred) or ADN with strong clinical experience
- Complete at least 3,000 hours of occupational health nursing practice over five years
- Apply for COHN certification from the American Board for Occupational Health Nurses (ABOHN) — application fee $150, exam fee $400
- The COHN exam is 160 questions (135 scored), taken over three hours
- Advance from employee health staff RN to COHN to OHN Manager or Director of Occupational Health
For salary data, see the companion occupational health nurse salary guide.
| Step | Requirement | Timeline |
|---|---|---|
| 1 | Earn BSN (preferred) or ADN + RN license | 2–4 years |
| 2 | Gain clinical RN experience (any setting) | 2–5 years post-licensure |
| 3 | Transition to occupational health / employee health RN role | Variable |
| 4 | Accumulate 3,000 OHN practice hours over 5 years | ~2–5 years in OHN role |
| 5 | Apply for COHN or COHN-S certification through ABOHN | After eligibility met |
| 6 | Advance to OHN Manager, Director, or Consultant | 5–10 years total |
What is an occupational health nurse?
An occupational health nurse (OHN) is a registered nurse who specializes in preventing and managing work-related illness, injury, and disability. Rather than responding to acute crises, the OHN’s job is largely preventive: identifying hazards before they injure workers, establishing health surveillance programs, and building the infrastructure that allows an employer to meet OSHA standards and reduce workers’ compensation costs.
OHNs occupy a unique intersection between nursing and public health. They function as clinicians, educators, case managers, safety consultants, and compliance advisors — often simultaneously, especially in smaller operations where one nurse covers the entire employee health function.
The specialty falls under the broader framework of occupational and environmental health, and OHNs typically report to a combination of human resources, risk management, and medical leadership depending on the employer.
How OHN differs from public health nursing
The comparison comes up frequently because both specialties work beyond the bedside. The key distinction is the population served and the authority structure.
Public health nurses work for governments and community organizations, protecting entire populations through disease surveillance, outbreak response, and health equity initiatives. Their work is policy-driven and population-focused. OHNs work for employers, protecting a defined workforce. Their work is employer-driven and focused on the health of individual workers within an occupational context. Where a public health nurse reports a disease cluster to the county health department, an occupational health nurse reports a musculoskeletal injury trend to the site safety committee.
For more on public health nursing, see how to become a public health nurse.
Education and experience requirements
Degree
A BSN is strongly preferred and increasingly required by larger employers. Many corporations, healthcare systems, government contractors, and manufacturing companies now list BSN as a minimum qualification for OHN roles. The BSN provides the research literacy, leadership grounding, and health education skills that occupational health work demands.
ADN-prepared RNs can enter the specialty, particularly through employee health roles in hospital systems or smaller manufacturing operations. However, ADN nurses will encounter a more limited job market and may find advancement to management or Director of Occupational Health roles difficult without completing an RN-to-BSN bridge program.
There is no dedicated undergraduate degree in occupational health nursing. OHNs typically enter from general acute care nursing and acquire occupational health skills through employer training, AAOHN educational programs, and continuing education.
RN license
A current, unrestricted RN license is required. There are no specialty licensing requirements beyond standard state RN licensure.
Clinical experience before transitioning
Most OHN positions expect 2–5 years of RN experience in general clinical nursing before the transition. Common background specialties include:
- Medical-surgical nursing
- Emergency nursing (strong alignment with injury assessment and emergency response)
- Occupational medicine (physician offices or urgent care with occupational medicine focus)
- Community or public health nursing
The clinical foundation matters because OHNs routinely perform independent assessments, manage acute work injuries without immediate physician backup, and make triage decisions that affect workers’ compensation claims. An OHN with limited clinical experience will struggle in settings where they are the only healthcare provider on site.
Graduate education
A master’s degree is not required to practice as an OHN or to earn COHN certification. However, an MSN — particularly one with an occupational health, public health, or nursing administration focus — significantly expands leadership and consulting opportunities. The University of Michigan and the University of Illinois Chicago both offer occupational health nursing specialization at the graduate level.
COHN certification — step by step
The Certified Occupational Health Nurse (COHN) and Certified Occupational Health Nurse-Specialist (COHN-S) credentials are issued by the American Board for Occupational Health Nurses (ABOHN), the specialty’s certifying body since 1972.
Certification is not required to work as an OHN, but it is widely expected by employers in larger industrial, corporate, and government settings. Many OHN job postings list COHN/COHN-S as a preferred or required qualification. The credential signals demonstrated competency across the full scope of occupational health nursing practice.
COHN vs. COHN-S: which credential is right for you?
| Requirement | COHN | COHN-S |
|---|---|---|
| Active RN license | Required | Required |
| OHN practice hours | 3,000 hours in past 5 years | 3,000 hours in past 5 years |
| Degree requirement | None | Bachelor's degree or higher (any field) |
| Practice focus | Direct clinical OHN practice | Management, supervision, specialty practice |
| Application fee | $150 | $150 |
| Exam fee | $400 | $400 |
| Exam format | 160 questions, 3 hours | 160 questions, 3 hours |
| Renewal cycle | Every 5 years | Every 5 years |
| Renewal CE | 50 CE hours in OHN | 50 CE hours in OHN |
ABOHN emphasizes that candidates should choose the credential that reflects their actual practice, not simply their educational level. A COHN-S-eligible nurse who works primarily in direct clinical care should sit for the COHN exam; a COHN-eligible nurse in a supervisory or consulting role should sit for the COHN-S exam. Both exam blueprints are available in the respective certification handbooks on the ABOHN website.
Step 1: Verify eligibility
Log into the ABOHN online portal and review the eligibility criteria against your current practice. You need:
- Active, unrestricted RN license
- 3,000 hours of OHN practice completed within the previous five years
For COHN-S, you also need a bachelor’s degree or higher (does not have to be a nursing degree).
ABOHN notes that alternatives to the practice hour requirement may be available; see the current certification handbook for details.
Step 2: Submit the application
Complete the online application through ABOHN’s portal. The application fee is $150 (non-refundable). Applications are valid for 90 days from the approval date.
Step 3: Pay the examination fee
Once your application is approved, ABOHN will invoice you for the $400 exam fee (non-refundable). You have 90 days from receipt of the invoice to pay it. After payment, you have 120 days to schedule and sit for the exam. A one-time 60-day extension is available for $50 if needed.
Step 4: Prepare for the exam
The exam covers five content domains: clinical care, health and safety promotion, case management, regulatory compliance, and emergency preparedness. AAOHN (the professional association) offers study resources, and Mometrix publishes a widely-used COHN practice test series.
Step 5: Sit for the exam
The exam consists of 160 questions — 135 scored and 25 unscored pre-test items — in a computer-based format administered at testing centers throughout the year. Candidates have three hours to complete it.
Step 6: Maintain certification
Certification is valid for five years. Renewal requires 50 continuing education hours in occupational health nursing and a renewal fee of $150. Late renewal incurs an additional $100 per year. Inactive status is available for a maximum of three years at $100.
Day-to-day responsibilities
OHN scope varies significantly by work setting and employer size. A single-site manufacturing OHN might handle everything from first aid to OSHA recordkeeping; a corporate OHN in a large company might focus almost entirely on program design and vendor management. The core functional areas are consistent across settings:
Clinical care. Injury assessment and treatment, pre-employment and periodic health examinations, immunization programs, health screenings (blood pressure, cholesterol, vision, audiometry), and management of occupational illness. OHNs in solo-coverage settings frequently manage acute injuries independently, referring to occupational medicine physicians as needed.
OSHA compliance. Maintaining the OSHA 300 injury and illness log, ensuring required medical surveillance programs are in place (for hearing conservation, respiratory protection, lead and hazardous chemical exposure), and supporting OSHA inspections.
Workers’ compensation case management. Coordinating care for injured workers, facilitating return-to-work planning, communicating with treating physicians and insurance adjusters, and implementing modified duty programs. This function closely parallels nurse case management; many OHNs also hold the Certified Case Manager (CCM) credential from the Commission for Case Manager Certification (CCMC) to formalize that competency.
Health promotion and wellness. Designing and running workplace wellness programs — fitness challenges, smoking cessation, stress management, chronic disease prevention — often in collaboration with employee benefits teams.
Toxicology screening. Managing the employer’s drug and alcohol testing program: random testing pools, post-incident collections, return-to-duty protocols, and coordination with certified collection sites and Medical Review Officers.
Emergency response planning. Developing and maintaining site emergency response plans, training employees in first aid and CPR, coordinating with local emergency services, and serving on the crisis management team.
Health education. Training employees on ergonomics, personal protective equipment use, bloodborne pathogen protocols, and workplace hazard communication.
Work settings
OHNs work wherever there is a workforce large enough or hazardous enough to justify dedicated health services. Common settings include:
Manufacturing and industrial. This remains the largest employment base for OHNs. Automotive plants, chemical manufacturing, food processing, aerospace, and electronics facilities employ OHNs to manage the injury and illness burden of physically demanding work. OSHA compliance and toxicology screening are central functions.
Corporate campuses. Technology companies, financial services firms, and large retailers employ OHNs through employee health or benefits functions. Work is weighted toward health promotion, mental health resources, ergonomics, and wellness program management.
Mining and energy. Oil and gas operations, coal mining, and utility companies employ OHNs — often as the sole healthcare provider on a remote site. These roles require strong independent clinical judgment and emergency preparedness capability.
Hospital and healthcare system employee health. Employee health departments within hospital systems serve the health and safety needs of healthcare workers themselves: exposure management after needlestick or blood/body fluid events, N95 fit testing, TB screening, mandatory immunization programs, and accommodation assessments.
Government agencies. The Department of Defense, Department of Veterans Affairs, and Department of Energy are significant federal employers of OHNs. The U.S. Postal Service and military contractors also hire OHNs in employee health roles. Federal positions follow the General Schedule (GS) pay scale, with OHN roles typically graded at GS-9 to GS-12.
Occupational health consulting firms. Some OHNs work for third-party consulting companies that provide occupational health services to multiple client employers. This model is common for smaller businesses that cannot justify a full-time OHN.
Career progression
The OHN career path has clear progression points:
Employee health staff RN (entry). Many OHNs start as employee health nurses in hospital systems before moving into industrial or corporate settings. This role builds the foundational occupational health skills — OSHA recordkeeping, pre-employment physicals, workers’ comp coordination — without requiring prior OHN experience.
Staff OHN / occupational health nurse (COHN). Once COHN-certified, most nurses in this role function with significant independence. They own the full occupational health program for their site or department.
OHN manager / occupational health supervisor (COHN-S). Management roles require the COHN-S credential in most organizations. Responsibilities expand to program oversight, budget management, policy development, and vendor management.
Director of occupational health. Senior leadership role, often regional or enterprise-wide in large organizations. Directors manage multiple sites or OHN teams, interface with senior HR and risk leadership, and set strategic direction for the occupational health program.
Independent consultant or contractor. Experienced OHNs with strong regulatory and clinical credentials frequently move into consulting — supporting small employers, serving as expert witnesses in workers’ compensation litigation, or building and selling occupational health programs.
Nurses interested in the disability management and care coordination side of OHN work may find the nurse case manager career guide useful as a companion resource.
Professional association: AAOHN
The American Association of Occupational Health Nurses (AAOHN) is the primary professional organization for OHNs in the United States. Founded in 1942, AAOHN publishes the Workplace Health & Safety journal, offers continuing education programs, runs an annual conference, maintains a job board, and provides certification preparation resources. Membership is valuable both for CE access and for the professional network OHNs need when working in solo-coverage industrial settings.
AAOHN also advocates for the specialty at the legislative level and publishes standards of practice for occupational health nursing.
Additional certification: CCM
Many OHNs carry the Certified Case Manager (CCM) credential alongside COHN. The CCM, issued by the Commission for Case Manager Certification (CCMC), validates competency in care coordination, workers’ compensation case management, disability management, and return-to-work processes. For OHNs in corporate, insurance, or government settings where case management is a primary function, the CCM credential can meaningfully expand earning potential and job market options.
Frequently asked questions
What is an occupational health nurse?
An occupational health nurse (OHN) is a registered nurse who specializes in preventing and managing work-related illness, injury, and disability. OHNs work in manufacturing, corporate, government, healthcare, and energy settings, providing clinical care, OSHA compliance support, workers’ compensation case management, and emergency response planning.
Do you need a BSN to become an occupational health nurse?
A BSN is strongly preferred. Most large employers — corporations, healthcare systems, government contractors, and major manufacturers — require or strongly prefer a BSN. ADN-prepared RNs can enter the specialty through employee health roles, but will find a more limited job market and face barriers to advancement into management roles without completing an RN-to-BSN program.
How many hours of experience do you need for COHN certification?
ABOHN requires 3,000 hours of occupational health nursing practice completed within the previous five years for both the COHN and COHN-S credentials. There is no requirement for a specific number of years as an RN before the OHN hours are counted, though most nurses need 2–5 years of general clinical experience before transitioning into occupational health.
How much does the COHN exam cost?
The ABOHN application fee is $150 and the examination fee is $400, for a total of $550. A one-time 60-day extension is available for $50 if you cannot sit within the initial 120-day exam window. All fees are non-refundable. Renewal every five years costs $150.
What is the difference between COHN and COHN-S?
Both credentials require the same 3,000 hours of OHN practice and carry the same exam format and fees. The COHN-S additionally requires a bachelor’s degree (in any field). ABOHN recommends choosing based on your actual practice: COHN for direct clinical OHN practice, COHN-S for supervisory, management, or specialty practice.
Can an occupational health nurse work from home?
Some OHN functions can be performed remotely — telehealth case management, disability coordination, and regulatory consulting. However, core OHN roles require on-site presence for injury assessment, pre-employment physicals, and emergency response. Corporate and consulting OHNs tend to have more remote flexibility than those in manufacturing or mining settings.
How is occupational health nursing different from public health nursing?
Public health nurses work for government agencies, focusing on population-level health across entire communities. OHNs work for employers, focusing on the health and safety of a defined workforce. Both emphasize prevention, but OHNs operate within an employer-employee authority structure while public health nurses operate within government and community frameworks.
What do occupational health nurses do in manufacturing?
In manufacturing settings, OHNs assess and treat acute work injuries, manage the OSHA 300 injury and illness log, operate hearing conservation and respiratory protection medical surveillance programs, manage workers’ compensation cases and return-to-work programs, and oversee the workplace drug and alcohol testing program. Many manufacturing OHNs are the sole healthcare provider on site.