Every construction project starts with a medical question that schedules often skip: if a worker is seriously hurt at the farthest corner of this site, how long until someone qualified is treating them? OSHA 1926.50 first aid requirements turn that question into an obligation. The answer decides whether a first aid kit and a certified responder are enough, or whether the site needs a medic, an onsite clinic, or a mobile unit.
This guide covers what the standard actually requires, how OSHA defines “reasonably accessible,” and how to match medical coverage to the site you are building, so the plan is in place before mobilization instead of after the first serious injury.
What OSHA 1926.50 Requires on Every Construction Site
29 CFR 1926.50, Medical services and first aid, applies across construction. In plain terms, it requires the employer to:
- Provide access to medical personnel for advice and consultation on occupational health matters.
- Arrange prompt medical attention for serious injuries before the project starts.
- Have a person with a valid first aid certificate on site when no infirmary, clinic, hospital, or physician is reasonably accessible in time and distance.
- Keep first aid supplies easily accessible in weatherproof containers, checked before each job and at least weekly.
- Provide a way to get injured workers to care, either transportation or a communication system to reach an ambulance.
- Post emergency numbers where 911 is not available, and make sure location information reaches EMS where it is.
- Provide eye and body drenching facilities where workers may be exposed to injurious corrosive materials.
Two of these are often missed. The first item requires access to medical personnel for occupational health advice, a role many contractors never formally assign. The second requires the medical plan to exist before work starts.
Some work carries additional requirements. Electric power transmission and distribution work under Subpart V has its own first aid and CPR training rules, and permit-required confined space rescue under Subpart AA requires rescuers trained in first aid and CPR.
What “Reasonably Accessible” Actually Means
The standard does not set a fixed time or distance, and this is where most confusion starts. OSHA has addressed it through interpretation letters:
- OSHA has recommended a person trained in first aid on site whenever professional medical attention is more than 8 minutes away from any point on the site, and has recognized 15 minutes as an appropriate maximum.
- Where life-threatening injuries such as falls, electrocution, suffocation, or severe bleeding can be expected, OSHA guidance points to a response within 3 to 4 minutes.
Three details change the math on real job sites. Time is measured from the farthest point of the site, not the gate. Realistic travel time counts, including security gates at plants, traffic, and stairs on structures where elevators are not yet running. And an ambulance arriving is not the same as care being delivered. Few sites with fall, electrical, or crush exposure can count on EMS alone inside a 3 to 4 minute window, which is why a certified first aid provider on site is the practical minimum on most active projects.
The Legal Minimum Is Not the Same as the Right Coverage
OSHA 1926.50 sets a floor for emergencies. It says nothing about how the far more common minor injuries are handled. A certified first aid provider can clean and bandage a wound, but cannot make clinical decisions, so any case in doubt goes offsite, often to an urgent care or ER.
That matters because the treatment an injured worker receives, not the injury itself, decides whether a case becomes an OSHA recordable. A cut closed with Steri-Strips on site stays first aid; the same cut closed with sutures offsite is recordable. See first aid vs. OSHA recordable: 12 construction injuries classified for how common job-site injuries fall on each side of that line. Choosing coverage is therefore both a safety decision and a cost decision.
Five Questions That Size Your Medical Coverage
1. How far is definitive care from the farthest point, in real minutes?
Drive it at the times crews actually work. Count gate clearance, traffic, and vertical travel.
2. How many workers, across how many shifts?
Coverage has to exist on every shift, including nights and weekends. A single first aid provider on day shift leaves the night crew uncovered.
3. What is the hazard profile?
Work at height, energized systems, heavy equipment, confined spaces, hot work, and heat exposure all raise both the likelihood of serious injury and the value of immediate response. On southern sites, heat alone can justify medical coverage through the summer; see our heat illness prevention protocol for construction sites.
4. How long will the project run, and at what peak headcount?
A three-week job and a three-year build need different answers. Coverage can scale with the project: first aid providers during site work, a medic at peak, and a clinic for multi-year programs.
5. Is it one site or many?
Contractors running several smaller sites in one region often need a different model than one large site: responders on each site, plus shared medical services that travel.
Onsite Medic vs. Onsite Clinic vs. Mobile Unit: What Each Covers
| Coverage model | What it is | Best fit | Limits |
| Certified first aid providers | Trained workers or supervisors with a valid first aid certificate and stocked kits | Small or short-duration sites where EMS and a clinic are close | No clinical decisions; any case in doubt goes offsite for evaluation |
| Onsite medic (EMT or paramedic) | Dedicated medical staff on site, working within physician-written protocols and standing orders | Active projects, shutdowns and turnarounds, remote sites, mid-to-large crews | Scope is limited to the protocols a physician authorizes |
| Onsite clinic | A staffed facility (nurses, PAs, or NPs under physician direction) for injury care, testing, physicals, and surveillance | Large, multi-year projects and plants with steady headcount | Requires space, steady volume, and a longer commitment |
| Mobile unit | A medical unit that travels to sites on a schedule | Multi-site contractors needing testing, physicals, and surveillance without sending crews offsite | Not continuous emergency coverage; pair with first aid providers or medics |
| Telemedicine layer | Clinician access by phone or video | Any model, especially after hours and on remote sites | Not hands-on care; supports the on-site team’s decisions |
Why physician oversight is the dividing line
An onsite medic without physician oversight can do little more than a certified first aid provider: assess, stabilize, and decide whether to send the worker offsite. With a physician medical director’s protocols and standing orders, the same medic can manage a wider range of injuries on site and escalate decisions to a physician in real time. Physician direction also satisfies the part of 1926.50 most contractors overlook: access to medical personnel for occupational health advice.
One point should be clear in any program: the goal is appropriate care at the site, not a shorter log. If an onsite medic provides treatment beyond first aid, the case is recordable, exactly as it would be at a clinic.
What the Right Coverage Changes
- Response time for serious injuries, which is the purpose of the standard.
- Minor injuries handled on site instead of defaulting to an ER or urgent care. Physician-governed onsite programs are how Occucare maintains a 93% onsite injury management rate.
- Accurate classification, because treatment decisions are made on medical need by qualified staff.
- Less lost time, because workers are evaluated in minutes and return to work with clear restrictions.
- Inspection readiness, with a written medical services plan that shows the assessment was done before mobilization.
Build the Medical Services Plan Before Mobilization
A written plan is the simplest way to show an inspector, an owner, or a general contractor that 1926.50 was addressed. It should record:
- Nearest clinic and hospital, with verified travel time from the farthest point of the site
- EMS access point, gate instructions, and how location information reaches dispatch
- Certified first aid providers on each shift, with certificates on file
- First aid kit locations and the weekly inspection log
- Drenching facilities where corrosive materials are present
- Transport arrangements for injured workers
- The medical personnel or physician available for occupational health advice
- Seasonal protocols such as heat, and escalation contacts for every shift
How Occucare Helps Size and Staff Site Coverage
Occucare offers every coverage level in one physician-governed program: onsite medics working under physician protocols and standing orders, permanent and shared onsite clinics, mobile units for scheduled testing and surveillance, and telemedicine for clinician access at any hour. Compare the options side by side on our onsite health care models page, or see how onsite clinics support large projects and plants.
Frequently Asked Questions
What does OSHA 1926.50 require on a construction site?
OSHA 1926.50 requires access to medical personnel for occupational health advice, a plan for prompt medical attention before the project starts, a certified first aid provider on site when medical care is not reasonably accessible, weatherproof first aid supplies checked weekly, a way to transport or call for help, posted emergency information, and drenching facilities where corrosive materials are used.
What does reasonably accessible mean under OSHA 1926.50?
The standard sets no fixed time or distance. OSHA has recommended a trained first aid provider whenever professional care is more than 8 minutes from any point on the site and has recognized 15 minutes as a maximum. Where life-threatening injuries such as falls, electrocution, or severe bleeding can be expected, OSHA guidance points to a 3 to 4 minute response.
Does OSHA require an onsite medic on construction sites?
No. OSHA 1926.50 requires a person with a valid first aid certificate on site when medical care is not reasonably accessible, not a medic. An onsite medic or clinic is a business and risk decision based on crew size, hazards, distance to care, and project length, and it goes beyond the legal minimum.
What is the difference between an onsite medic and an onsite clinic?
An onsite medic is an EMT or paramedic stationed at the site to respond to injuries within physician-written protocols. An onsite clinic is a staffed medical facility, typically with nurses, physician assistants, or nurse practitioners under physician direction, that also handles testing, physicals, surveillance, and follow-up care. Clinics fit large, long-running projects.
Can a mobile medical unit replace onsite emergency coverage?
Generally, no. A mobile unit brings scheduled services such as drug testing, physicals, and medical surveillance to job sites so crews do not have to travel. It is not continuous emergency coverage, so sites still need certified first aid providers or an onsite medic to meet 1926.50 and respond to injuries.
| Match Medical Coverage to the Site Before Work StartsOccucare supports construction and industrial employers from Houston-area job sites to projects across the U.S. and internationally through a network of 3,000+ vetted clinics. Request a consultation to size medical coverage for your next project and put a 1926.50-ready medical services plan in place before mobilization. |
