A serious injury on a construction site rarely happens next to a medic. Crews work on large, loud, sometimes remote sites, and the first people on the scene are usually coworkers with no formal emergency training. This guide walks you through the first minutes of a construction site injury when no first responder is nearby: securing the scene, calling for help, starting CPR, stopping bleeding, protecting the spine, treating burns and heat illness, and handing off to EMS. You need no medical background to begin. Current CPR and First Aid training, a stocked first aid kit, and an accessible AED (automated external defibrillator, a device that analyzes heart rhythm and delivers a shock if needed) will make every step more effective.
Step 1: Stop Work and Make the Scene Safe
Before you touch anyone, stop the thing that may hurt the next person. Shut down nearby equipment, cranes, and powered tools, and tell everyone in the area to stay clear unless you ask for them. If you can lock out or de-energize a machine safely, do it. If you cannot, keep people away from it.
Then look for whatever caused the injury and ask whether it could injure you too. On a construction site the usual suspects are:
- Unstable structures, loose scaffolding, or materials that could fall or shift
- Live electrical lines or damaged cords and equipment
- Trench walls that could cave in again
- Overhead loads or work still going on above you
- Fumes, low oxygen, or other hazardous atmospheres in confined spaces
The most common mistake is rushing in and becoming a second victim. In a trench collapse or a confined space incident, do not enter without proper rescue training and equipment. Many would-be rescuers have died in these situations. Your job is to keep others out, call for help, and support the victim from outside the hazard until a trained rescue team arrives.
Do not move an injured worker unless there is immediate danger, such as fire, an active collapse risk, or exposure to something that will keep harming them. Moving someone with a possible spine injury can make it worse. If you must move them, drag or pull along the long axis of the body, keeping the head and neck in line as much as you can, and go only as far as safety requires.
Once the area is controlled, put on gloves from the first aid kit if they are available. Keep one person responsible for holding the perimeter so bystanders and equipment operators do not wander into the scene.
Step 2: Check the Worker and Call 911
Approach the worker, tap their shoulder, and shout their name or ask, "Are you okay?" Look at the chest for normal breathing. Spend no more than 10 seconds on this check. Gasping, snoring sounds, or irregular gulping breaths are not normal breathing and should be treated as no breathing.
Now delegate. A general shout such as "Someone call 911" often results in everyone assuming someone else did it. Point at specific people and use their names:
- "Dave, call 911 now and come back to tell me what they said."
- "Maria, get the first aid kit and the AED and bring them here."
- "Luis, go to the front gate and wait for the ambulance."
If you are alone, call 911 on speaker so your hands stay free, then begin care.
What to tell the dispatcher
Large sites cause real delays, so give precise location details:
- The exact street address of the site, plus the nearest cross street or the gate number to use
- Where on the site the victim is, such as "north side, third floor, east stairwell"
- The type of injury: fall, electrocution, crush, bleeding, unresponsive
- How many people are hurt
- Any ongoing hazard, such as a trench or live power
Stay on the line until the dispatcher tells you to hang up. They can coach you through CPR or bleeding control and will tell you what to expect.
The person sent to the entrance matters more than it seems. Locked gates, unmarked access roads, and unfamiliar site layouts are a common cause of EMS delay. That person should unlock or open the gate, switch on a flashlight or wave a bright vest if needed, and lead the crew directly to the patient.
Step 3: Start CPR and Use an AED if the Worker Is Unresponsive
If the worker does not respond and is not breathing normally, start CPR immediately. Do not wait to see whether they recover on their own. Place the heel of one hand on the center of the chest, put your other hand on top, and push hard and fast. Current American Heart Association (AHA) guidance for adults calls for compressions at 100 to 120 per minute, at least 2 inches deep, allowing the chest to fully recoil between pushes. If you are untrained or unsure, hands-only CPR (continuous compressions without rescue breaths) is appropriate. If you are trained, add breaths at the ratio you learned. Check the AHA website for the most recent guideline wording, since recommendations are updated periodically.
When the AED arrives, turn it on and follow its voice prompts. Expose the chest, dry it if it is wet or sweaty, and apply the pads to bare skin as shown in the pictures on them. Keep everyone clear while the device analyzes, and press the shock button only if it tells you to. Then resume compressions right away when it instructs.
Construction-specific causes
Cardiac arrest on site can follow electrocution, a fall, or heat illness, as well as ordinary heart problems. With electrocution, confirm the power source is off before you touch the worker. Do not assume it is, and do not use a conductive object to move a wire unless you are trained to do so. After a fall, keep the head and neck as still as practical while you do compressions, but do not delay CPR for fear of the spine. A heart that is not beating is the more urgent problem.
When to stop
Continue until EMS takes over, the worker shows clear signs of life such as breathing or movement, the AED advises otherwise, or you are too exhausted to continue. Compressions are tiring, and quality drops fast. If more than one person is trained, swap every two minutes, ideally during the AED's analysis pause, so the break in compressions stays short.
Step 4: Control Severe Bleeding
Life-threatening bleeding can kill within minutes, so treat it as soon as breathing and the scene are handled. Cover the wound with gauze or a clean cloth and press down firmly with both hands, using your body weight. Do not ease up to peek. If blood soaks through, add more layers on top rather than lifting the saturated material, which can pull away forming clots.
Tourniquets
A tourniquet is a band with a tightening device that stops blood flow to a limb. Use a commercial tourniquet for life-threatening bleeding from an arm or leg that direct pressure is not controlling. Place it 2 to 3 inches above the wound, not over a joint, and tighten until the bleeding stops. This is painful, which is expected. Note the time of application on the device or on the worker's skin, and tell EMS. Do not loosen it.
Deep wounds and hemostatic dressings
A hemostatic dressing is gauze treated with an agent that helps blood clot. If you are trained, pack a deep wound tightly with plain or hemostatic gauze, filling the cavity, then hold firm pressure for several minutes without stopping.
Amputations and impaled objects
For an amputation, control the bleeding first. Then wrap the severed part in clean gauze, place it in a sealed plastic bag, and put the bag on ice. Never put the part directly on ice, since freezing damages tissue and reduces the chance of reattachment. Send it with the patient.
If an object is impaled in the worker, leave it in place. Removing it can trigger heavy bleeding that you cannot reach. Stabilize it with bulky dressings or folded cloth around it so it cannot move, and keep the worker still.
Step 5: Manage Falls, Head, and Spine Injuries
Suspect a spinal injury after any fall from height, a struck-by incident, or a blow to the head. Spinal motion restriction means limiting movement of the head, neck, and back to avoid worsening a possible spinal injury. In the field, that means keeping the worker still and supporting the head in the position you found it. Kneel at the head, hold it gently with both hands, and tell the worker not to move. Have others clear the area so nobody jostles them.
Watch for warning signs and report them to the dispatcher and EMS:
- Confusion or drowsiness that worsens
- Vomiting
- Pupils of unequal size
- Numbness, tingling, or weakness in the arms or legs
- Severe neck or back pain
When you may have to move them
If the worker is vomiting or cannot keep their airway clear, breathing takes priority over spine protection. Roll them onto their side as a single unit, with one person holding the head and neck in line with the torso while others turn the shoulders and hips together. The tradeoff is a small risk of aggravating a spinal injury against a much larger risk of choking. Choose the airway.
Do not remove a hard hat unless it blocks breathing or prevents you from giving care. It often helps hold the head steady. And avoid two common errors: sitting the worker up to "walk it off," and giving them water. Anyone with a head injury may need surgery or lose consciousness, and food or drink raises the risk of choking.
Step 6: Treat Burns, Eye Injuries, and Heat Illness
Thermal and chemical burns
For heat burns from hot materials, welding, or fire, cool the area under cool running water for about 20 minutes, then cover it loosely with a clean, non-stick dressing. Do not use ice, which can deepen tissue damage, and do not apply butter, oils, or ointments. Remove rings, watches, and tight clothing near the burn before swelling starts, unless they are stuck to the skin.
For chemical burns, remove contaminated clothing and flush the skin with large amounts of water. Have someone find the product's Safety Data Sheet (SDS), which lists first aid measures and is required to be accessible on site. Give the product name to the dispatcher.
Eye injuries
For chemical splashes, hold the eye open and flush with water for at least 15 minutes, directing the stream from the inner corner outward so you do not wash the chemical into the other eye. For a piece of embedded debris, do not try to remove it and do not press on the eye. Cover both eyes loosely with a rigid shield, such as a paper cup taped over each eye, because the eyes move together and covering both reduces movement.
Heat stroke
Heat stroke is a medical emergency. Signs include confusion, slurred speech, hot and flushed or dry skin, and collapse. Call 911, move the worker to shade, remove excess clothing, and cool aggressively. Pour water on the body and place ice packs at the neck, armpits, and groin. If cold water immersion is available and the worker is alert enough, that is even better. Keep cooling until EMS arrives.
Step 7: Hand Off to EMS and Document the Incident
When EMS arrives, give a brief, organized report. Cover what happened, the time of injury, what care you provided, and any numbers that matter: tourniquet application time, how many AED shocks were delivered, and when CPR began. Hand over any severed part or the worker's known medical information. Then step back and let the crew work.
Preserve the scene for investigation unless doing so endangers others. Avoid cleaning up, moving equipment, or altering conditions beyond what safety requires. Take photos if you can do so safely, and write down names of witnesses while memories are fresh.
Report the injury to your supervisor right away. OSHA has specific reporting rules under 29 CFR 1904.39. As of the current standard, employers must report a work-related fatality within 8 hours, and an in-patient hospitalization, an amputation, or the loss of an eye within 24 hours. Rules can change, so verify the present requirements on OSHA's website or with your safety officer.
Plan the fix
OSHA's construction standard at 29 CFR 1926.50 requires medical and first aid availability, including a trained first aider where no infirmary or hospital is in near proximity. After an incident, use the moment to close gaps:
- Schedule CPR, First Aid, and AED training for your crew
- Designate trained responders on every shift
- Check first aid kit contents and expiration dates
- Test the AED, including pads and battery
Walk Your Site This Week and Train Your Team
The steps above work only if the tools and people are in place before anything happens. This week, walk your site and confirm where the AED is, whether the first aid kit is fully stocked, and whether everyone knows the emergency address, gate number, and meeting point for EMS. Post that information where workers will see it.
Then make sure someone on every shift can act on it. Midwest CPR Center offers CPR, First Aid, and AED training so trained responders are always on your site. Don't wait until an emergency happens. Equip yourself and your team with life-saving skills today. Schedule your CPR certification class now and gain the confidence to respond when every second counts.