Respirator Medical Evaluation Requirements

OSHA Respirator Medical Evaluation: 1910.134(e) Requirements (2026 Guide)

OSHA 29 CFR 1910.134(e) prohibits assigning a respirator to any worker until a Physician or Licensed Health Care Professional (PLHCP) has determined that the worker is medically able to wear it. The evaluation is a prerequisite — not a formality — because respirator wear imposes real physiological burdens on the cardiovascular and pulmonary systems. This guide decodes every element of the 1910.134(e) requirement: who qualifies as a PLHCP, how the Appendix C questionnaire works, what outcomes the PLHCP can issue, and what triggers re-evaluation.

Why Medical Evaluation Exists: Physiological Burden of Respirator Wear

Wearing a respirator is not physiologically neutral. Even a properly fitted half-face air-purifying respirator (APF 10) adds measurable resistance to inhalation and exhalation, forces the worker to breathe harder to achieve the same minute ventilation, and increases dead space (particularly with elastomeric designs). At the extreme end, a supplied-air or SCBA unit adds significant weight (a typical SCBA cylinder + harness runs 25–35 lbs) and restricts field of vision and mobility.

The physiological burdens employers must account for include:

• Increased breathing resistance — filtration media and cartridge sorbent beds impose inhalation and exhalation resistance even when clean; resistance rises as filters load with particulate.
• Cardiovascular load — the extra effort required to breathe through a respirator elevates heart rate and blood pressure; workers with cardiovascular disease, hypertension, or recent cardiac events face amplified risk.
• Heat stress — full-face and SCBA facepieces reduce convective and evaporative cooling from the face; in warm or humid environments this compounds heat stress for workers already at risk. How that burden enters the heat numbers - as clothing adjustment factors added to measured WBGT - is covered in WBGT vs heat index.
• Claustrophobia and anxiety triggers — some workers experience anxiety, claustrophobia, or panic symptoms when wearing full-face respirators or SCBA; these responses can cause the worker to impulsively remove the respirator in a hazardous atmosphere.
• Musculoskeletal strain — SCBA cylinder weight, combined with PPE, tools, and task demands, can stress the lumbar spine and shoulder girdle, particularly for workers with pre-existing musculoskeletal conditions.

Legal basis: 29 CFR 1910.134(e)(1) states that the employer shall provide a medical evaluation to determine the employee's ability to use a respirator, before the employee is fit tested or required to use the respirator in the workplace. The regulation leaves no discretion: an employer who assigns a respirator to a worker without a prior medical evaluation is in violation, regardless of whether the worker actually suffers harm.

For workers assigned to full-face respirators (APF 50) — which are more physiologically demanding than half-face units — the medical evaluation carries particular importance because the tight facepiece seal, full-face enclosure, and higher cartridge resistance compound respiratory effort and heat exposure simultaneously.

When Medical Evaluation Is Required

Not every respirator use triggers the 1910.134(e) requirement. The standard distinguishes between mandatory program participants, voluntary users, and SCBA users.

Mandatory respirator program workers

Any worker required by the employer (or by a chemical-specific standard) to wear a respirator as part of a formal respiratory protection program must receive a medical evaluation before initial fit testing and before the first use of the respirator. This includes workers in programs built around half-face APRs, full-face APRs, powered air-purifying respirators (PAPRs), and supplied-air respirators (SARs).

Voluntary respirator users

When a worker chooses to wear a respirator that is not required by the employer (and the respirator is not a filtering facepiece, i.e., it is a tight-fitting elastomeric device), the employer must provide the worker with the information in Appendix D to 1910.134. Appendix D is a one-page informational notice about proper respirator use, maintenance, and storage. A full 1910.134(e) medical evaluation is not required for voluntary APR use unless the employer determines that conditions warrant one. For filtering facepiece (N95/P100 disposable) voluntary use, Appendix D notice suffices with no additional requirements.

SCBA and SAR users

Workers assigned to self-contained breathing apparatus (SCBA) or supplied-air respirators (SAR) must receive both the questionnaire-based medical evaluation and, typically, a formal medical examination. The physiological demands of SCBA use — physical exertion under high task load, heat stress, weight burden, potential IDLH atmospheres — require a more thorough clinical review than the questionnaire alone provides.

The PLHCP: Who Qualifies and What They Do

The term "Physician or Licensed Health Care Professional" (PLHCP) is defined at 29 CFR 1910.134(b) as an individual whose legally permitted scope of practice (i.e., license, registration, or certification) allows them to independently provide or be delegated the authority to provide some or all of the health care services required by paragraph (e). In practice this means:

• Medical doctors (MDs) and doctors of osteopathic medicine (DOs) — qualified in all states
• Nurse practitioners (NPs) and physician assistants (PAs) — qualified in states where their scope of practice permits independent medical evaluation and issuance of written work-capacity determinations
• Certified Occupational Health Nurses (COHNs) — may qualify for evaluation activities within their licensed scope, but cannot independently issue a written medical determination in most states without physician oversight

The key criterion is whether the individual can independently perform the evaluation and issue the written determination. An occupational health nurse who works under a physician's standing orders may satisfy this requirement in some state contexts; employers should verify with their legal counsel and the PLHCP's licensing board.

Information the employer must provide to the PLHCP

Per 1910.134(e)(5), before or at the time of the evaluation the employer must provide the PLHCP with:

1. The type and weight of the respirator to be used by the employee
2. The duration and frequency of respirator use (including use for rescue and escape)
3. The expected physical work effort during respirator use
4. Additional protective clothing and equipment to be worn
5. Temperature and humidity extremes that may be encountered

The employer must also provide the PLHCP with a copy of the standard 29 CFR 1910.134 and its appendices, a description of any other medical information relevant to respirator use, and any information from previous medical evaluations that is available to the employer.

Independence and conflict of interest

The PLHCP cannot be an employee of the employer who is directly supervised by management in a way that creates a conflict of interest. Occupational medicine clinics — including hospital-affiliated occupational health clinics and third-party occupational health providers — are the standard vehicle. Telehealth platforms that employ licensed physicians or NPs and provide written determinations meeting OSHA's documentation requirements are acceptable where state telehealth practice laws permit. Employers should obtain written confirmation that the telehealth provider's scope meets 1910.134(b) requirements in the state of employment.

What the employer receives

The PLHCP issues a written recommendation to the employer — not a medical record, not a diagnosis, and not the questionnaire responses. The written recommendation states only whether the worker is medically able to wear the assigned respirator, and if so, whether any conditions apply. The employer never sees the specific medical information that informed the PLHCP's decision. This confidentiality structure is by design: it enables honest disclosure by workers who would otherwise fear employment consequences from revealing health conditions.

Appendix C Questionnaire Decode

Appendix C to 29 CFR 1910.134 is the OSHA-mandated questionnaire that workers complete and submit directly to the PLHCP. It has two parts: Part A (mandatory for all workers in a respirator program) and Part B (supplemental questions for SCBA users and workers whose Part A responses indicate potential health concerns).

Part A — Questions all workers must answer

Part A consists of questions about demographics (age, height, weight, sex) and 10 yes/no health history questions. Key questions and their APF implications are decoded in the table below:

Part B — Supplemental questions

Part B is required for SCBA users and is also administered at PLHCP discretion when Part A responses indicate potential issues. Part B asks about claustrophobia (fear of enclosed spaces), anxiety, claustrophobic responses to full-face coverage, exercise tolerance (can the worker climb a flight of stairs carrying a 25-lb load without stopping to rest?), skin conditions that may prevent adequate facepiece seal, and prior history of medical evaluation rejection for respirator use.

Workers complete Appendix C confidentially and submit directly to the PLHCP — not to HR or the employer. This is a regulatory requirement, not optional. Employers who route questionnaires through HR before PLHCP review are in violation of 1910.134(e)(2)(ii).

Medical Determinations: The Three Outcomes

After reviewing the Appendix C questionnaire (and examination, if warranted), the PLHCP issues a written determination to the employer per 1910.134(e)(6). There are three possible outcomes:

Outcome 1: Approved

The worker is medically cleared to use the assigned respirator type under the described conditions. The employer proceeds to schedule fit testing and incorporate the worker into the respiratory protection program. No restrictions apply.

Outcome 2: Approved with conditions

The worker is medically cleared, but only under specified limitations. Examples of conditional determinations include:

• "Approved for half-face negative-pressure APR only — not approved for full-face or SCBA."
• "Approved for APR use up to 2 continuous hours; breaks of at least 15 minutes required between use periods."
• "Approved for low-exertion tasks only — not approved for strenuous physical activity while wearing respirator."
• "Approved pending prescription safety glasses (corrective lenses) compatible with assigned full-face respirator."

The employer must accommodate these conditions in the written respiratory protection program (WRPP) and in the worker's job assignment. If the conditions cannot be accommodated — for example, the worker's assigned task requires SCBA and the PLHCP approves APR only — the employer must redesign the task, provide alternative controls, or reassign the worker to a task that fits within the determination's scope.

Outcome 3: Not approved

The worker is not medically cleared to wear the assigned respirator type. A "not approved" determination does not legally require termination and should not be treated as a disciplinary or termination trigger. The employer's obligation shifts to finding other means of protecting the worker: engineering controls (ventilation, enclosure, substitution), administrative controls (reassignment to a non-respiratory-hazard task), or alternative respiratory protection types (e.g., PAPR, which requires no negative-pressure effort and has no seal-dependent APF for workers whose condition prevents tight-fitting facepiece seal).

What the employer receives — and does not receive: The written determination names the worker, states the determination outcome (approved / approved with conditions / not approved), and specifies any conditions. It does not contain a diagnosis, the questionnaire responses, or any underlying medical information. The PLHCP retains all confidential medical information. The employer may not pressure the PLHCP for the underlying medical information, and doing so may expose the employer to HIPAA liability if the PLHCP is a covered entity.

When a Medical Examination Is Required Beyond the Questionnaire

The Appendix C questionnaire is the floor of 1910.134(e) compliance — but the questionnaire alone is not always sufficient. A formal medical examination (physical examination, pulmonary function testing, or other clinical assessment) is required or triggered in the following situations:

• SCBA assignment: Workers assigned to SCBA — whether for emergency response, firefighting, or hazmat operations — require a physical medical examination in addition to the questionnaire. The physiological demands and IDLH risk profile of SCBA use make clinical examination a best-practice standard even where not explicitly mandated by 1910.134(e) alone.
• Appendix C responses indicate potential health concerns: If a worker answers "yes" to questions about cardiovascular disease, pulmonary disease, medications that affect cardiovascular or pulmonary function, or claustrophobia, the PLHCP has the authority — and the obligation — to request a follow-up examination before issuing a determination. 1910.134(e)(3)(i) explicitly preserves the PLHCP's discretion to require any examination or test they determine is necessary.
• PLHCP clinical judgment: Independent of specific questionnaire responses, the PLHCP may determine that examination is warranted based on the worker's age, work conditions, or other factors visible from the information provided.
• Chemical-specific standards: Several OSHA chemical-specific standards require annual medical examinations as part of medical surveillance programs that encompass (but are broader than) respirator clearance:
  • 29 CFR 1910.1025 (lead): annual medical examination for workers with blood lead levels above specified triggers
  • 29 CFR 1910.1028 (benzene): annual medical examination for workers with significant benzene exposure
  • 29 CFR 1926.1153 (silica, construction): medical examination for workers exceeding the action level for 30 or more days per year (including chest x-ray, pulmonary function testing, and symptom review)
  • 29 CFR 1910.1001 (asbestos): medical surveillance for workers with significant asbestos exposures

Employers managing workers under chemical-specific standards should coordinate respirator medical evaluations with the required medical surveillance program so that workers are not subjected to duplicative clinical assessments. The PLHCP conducting chemical-specific surveillance can typically issue the 1910.134(e) written determination as part of the same evaluation visit.

For silica-exposed construction workers specifically, the OSHA 1926.1153 silica standard requires medical examinations that go well beyond the 1910.134(e) questionnaire. See that reference guide for detail on silica surveillance thresholds and exam components.

Re-Evaluation Triggers

A medical evaluation does not have a fixed expiration date under 29 CFR 1910.134(e) itself. The standard specifies conditions that trigger a new evaluation rather than mandating a calendar interval. However, ANSI/ASSP Z88.2-2015 (the consensus standard on respiratory protection programs) recommends annual medical re-evaluation for workers in ongoing respirator programs as a best practice — and many occupational health providers and OSHA compliance advisors consider annual re-evaluation prudent.

Specific triggers under 1910.134(e)(7)

• Worker self-report: The worker reports signs or symptoms related to their ability to use a respirator — including shortness of breath during respirator use, dizziness, chest pain, claustrophobic episodes, or other symptoms that did not exist at the time of the original evaluation.
• PLHCP, supervisor, or program administrator recommendation: Any of these parties recommends re-evaluation based on observed performance or clinical concern.
• Program evaluation finding: The annual program evaluation conducted by the program administrator identifies information or conditions suggesting that re-evaluation is needed for one or more workers.
• Change in work conditions: The worker is assigned to a different respirator type (especially an upgrade to higher APF or SCBA), a new hazard is introduced that changes the duration or intensity of respirator use, or environmental conditions change in a way that increases physiological burden (e.g., work in higher ambient temperatures).

Employers who change a worker's respirator assignment — for example, moving from a half-face APR to a full-face respirator for higher-hazard tasks — should treat the change as a trigger for re-evaluation. The original determination was issued in the context of the original respirator type and conditions; a new respirator type with different physiological demands requires a fresh evaluation against the new context.

Annual re-evaluation best practice

While 1910.134(e) does not mandate annual re-evaluation, employers following the ANSI/ASSP Z88.2 standard typically schedule annual medical clearance updates. This practice aligns with the broader annual program evaluation required under 1910.134(l) and ensures that workers whose health status has changed since the original evaluation are identified before an adverse event occurs.

Related reference

Closely related on this site: how to don and doff a respirator, how to read a respirator cartridge label, how to seal check a respirator, and p100 vs n95: what's the difference and which do you need?.

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Researched and written by Steven Eaton, editor of WC Safety. Steven holds no safety certification and does not test products; this page compares what manufacturers and regulators publish, with the gaps in that record marked. Last reviewed August 2026.

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