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For a crush injury with severe bleeding, call emergency services early, make the scene safe, and remove the crushing force as soon as it is safe and physically possible. Control serious external bleeding with firm direct pressure; use a tourniquet for life-threatening bleeding from an arm or leg when pressure does not control it, but do not delay release just to apply one routinely. Keep the person warm, monitor them, and arrange urgent hospital assessment even if they seem relatively well.
What should you do first?
At a construction site, treat a person trapped by a load, equipment, or another crushing force as an emergency. Your priorities are scene safety, an early call for professional help, safe release, bleeding control, and close monitoring. Do not put yourself or other workers in danger to reach the casualty.
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- Check the scene. Look for hazards that could injure you, the casualty, or others. Do not enter an unsafe area or attempt a rescue that is beyond your physical ability. If the scene is not safe, move to safety and tell the emergency dispatcher what is preventing access.
- Call emergency services early. Ask a specific person to call the local emergency number and report a crush injury, whether the person is trapped, any severe bleeding, and the site location and safest access point. If you are alone and can do so safely, use speakerphone so you can keep communicating while helping. Resuscitation Council UK advises calling early and ideally using speakerphone, especially when alone (First Aid Guidelines).
- Arrange a safe release. If it is safe and physically possible, remove the crushing force as soon as possible. Do not delay release to apply a tourniquet routinely in an attempt to prevent reperfusion injury. If the person has actual or anticipated life-threatening bleeding from a limb, a tourniquet may be used before or immediately after release only if applying it does not delay release, according to ANZCOR’s crush-injury guidance.
- Control severe bleeding. Apply firm, continuous direct pressure to the bleeding wound. Use a dressing if one is available. If the bleeding is life-threatening and comes from an arm or leg but does not stop with pressure, a tourniquet may be needed. Follow your training and dispatcher instructions.
- Stay with the person and reassess. Reassure them, keep them warm, and keep checking their responsiveness, breathing, and overall condition while help is coming. Follow dispatcher instructions if their condition changes or they become unresponsive.
- Get hospital assessment. Do not assume the person is safe because pain is limited, they can talk, or there is little visible injury. Crush injuries can cause serious problems without obvious external signs; ANZCOR recommends immediate hospital investigation after any crush injury, including pressure from a person’s own body weight while immobile.
The ANZCOR guideline states: “Remove all crushing forces as soon as possible if safe to do so.” That is not a reason to ignore an unsafe scene, attempt an impossible lift, or disregard the emergency dispatcher. If safe release is not possible, keep the dispatcher informed and follow their directions while awaiting responders.
How do you decide whether the scene is safe enough to help?
Help only when you can approach without creating another casualty. If there is an ongoing hazard or you cannot safely reach the person, do not enter; call emergency services and clearly describe the situation.
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On a construction site, several people may be able to help with different tasks: one calls emergency services, another directs responders to the site entrance, and a trained first aider attends only if the route is safe. Keep bystanders back from the hazard and preserve a clear route for responders. Do not guess that a load, machine, or other crushing force is stable simply because it has stopped moving. If you are unsure whether a release can be carried out safely, tell the dispatcher and wait for direction.
Be precise when describing the location: give the site address, the entrance responders should use, and the area or structure where the casualty is located. State whether the person remains trapped and whether bleeding appears severe. These details help responders understand what they may encounter and how to reach the casualty.
When should the crushing force be removed?
Remove the crushing force as soon as it is safe and physically possible; do not wait for pain or other symptoms to appear. The practical limit is safety: do not create a further collapse or expose rescuers to a hazard, and take the emergency dispatcher’s directions into account.
A common concern is that releasing a trapped person could cause a harmful effect sometimes called reperfusion injury. ANZCOR says there is insufficient evidence to recommend routinely applying a tourniquet before release to delay that effect. Its crush-specific recommendation is to use a tourniquet when there is actual or anticipated life-threatening limb bleeding, before or immediately after release, provided this does not delay release.
That distinction matters: a crush injury alone is not a reason to put on a tourniquet. Nor should a bystander wait to release the person while trying to find or apply one. If release cannot be performed safely or the person is bleeding severely, tell the dispatcher what is happening and follow their instructions.
How do you control severe external bleeding?
Start with firm, direct manual pressure on the wound. If pressure does not control life-threatening bleeding from an arm or leg, a tourniquet is an option; hemostatic dressings and wound packing have narrower uses and may require training.
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Uncontrolled bleeding is time-critical: the 2024 American Heart Association and American Red Cross first-aid guideline says it is the most important preventable cause of death in 35% of trauma patients and can occur before emergency services arrive. This is the guideline’s figure, not a prediction about any particular casualty. The guideline describes direct pressure as the mainstay of first aid for external bleeding (2024 AHA and American Red Cross Guidelines for First Aid).
Direct pressure
Press firmly on the source of external bleeding and maintain pressure. A dressing can help cover the wound, but the key first measure is pressure. If bleeding remains life-threatening, do not treat a dressing alone as proof that the bleeding is controlled. Continue to follow dispatcher instructions and get urgent professional care.
Tourniquets: only for life-threatening bleeding from a limb
A tourniquet is for severe bleeding from an extremity, not for wounds on the torso or other locations where a limb tourniquet cannot be applied. The AHA and American Red Cross recommend a tourniquet when direct pressure does not control life-threatening extremity bleeding. In a crush incident, ANZCOR adds the crucial timing condition: tourniquet use must not delay safe release of the crushing force.
Resuscitation Council UK’s public instructions say to place the tourniquet 5–7 cm above the injury, not over a joint; tighten it until bleeding stops; note the time; and do not release it. Those are UK-specific instructions. Use a commercial windlass tourniquet only if available and appropriate, and follow your local training, emergency dispatcher, and device instructions. Do not loosen or remove an applied tourniquet while waiting for responders.
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A hemostatic dressing can be used as an adjunct to pressure in some life-threatening bleeding situations, including when a tourniquet cannot be applied, is unavailable, or does not stop the bleeding. It is not a substitute for calling emergency services or obtaining care. Follow the product instructions and your training.
Wound packing is not suitable for every wound. American Red Cross guidance includes packing for certain wound sites when the rescuer is trained; do not pack a wound simply because bleeding is severe. If you have not been trained for the wound and method in front of you, keep to firm direct pressure and dispatcher instructions.
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Pressure dressings
Once bleeding is under control, a pressure dressing can help maintain it, as described in the UK guidance. Do not use the dressing as a reason to stop monitoring the person or to delay transfer to professional care.
How should you choose among the bleeding-control options?
The right measure depends on more than how much blood you can see. Consider the bleeding severity, the body location, whether direct pressure is working, whether a tourniquet can fit the injured limb, your training, and whether a crushing force is still present.
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- Direct pressure is the starting point. It is the mainstay for external bleeding and can be applied to many wound locations. Keep pressure on the source rather than repeatedly lifting a dressing to inspect it.
- A tourniquet is location-specific. Use it for life-threatening bleeding from an arm or leg that is not controlled by direct pressure. It is not a treatment for torso bleeding or a routine step for every crush injury. If a crush force remains, never let tourniquet placement delay a safe release.
- Hemostatic gauze is an adjunct. It may augment pressure when a tourniquet cannot be applied, is unavailable, or has not stopped bleeding. It still requires sustained pressure and appropriate training; it does not replace emergency activation.
- Wound packing has defined indications. Red Cross guidance includes packing for certain sites when the rescuer is trained. Do not generalize that technique to every open wound or improvise it without instruction.
- A pressure dressing comes after control. UK guidance describes using one to maintain cessation once bleeding has stopped. It is a way to hold the result, not a reason to stop reassessing the person.
If you are uncertain which option fits, state the wound location and bleeding severity to the dispatcher. Follow local training and the device instructions you have rather than combining techniques at random.
What if the crushing force cannot be removed immediately?
Do not attempt an unstable lift, cut through machinery, or enter a hazardous area simply because the person is distressed. Tell the dispatcher exactly what is trapping the person, what makes access unsafe, and whether bleeding is visible. Ask what they want you to do while specialist responders are coming.
If you can safely reach a wound without disturbing the unstable force, apply firm direct pressure and continue monitoring. If life-threatening limb bleeding is present, a tourniquet may be applied before release only when doing so will not delay release; this is the specific crush-injury exception in ANZCOR guidance, not a blanket rule. If you cannot reach the wound or cannot act safely, keep the call open and relay changes.
What should you do while waiting for responders?
Stay with the casualty if it is safe, reassure them, and keep them warm. Continue to watch their responsiveness, breathing, and condition; report changes to the emergency dispatcher and follow the dispatcher’s instructions.
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A person can have a serious crush injury even when the wound looks small or there is no obvious wound. Do not wait for pain, swelling, or a visible change before seeking help. ANZCOR advises hospital assessment after any crush injury, including compression caused by a person’s own body weight while immobile. The reason is practical: a bystander cannot rule out serious internal consequences based on appearance alone.
Keep the response focused on first aid rather than attempting treatment beyond your training. Do not give fluids, medication, or clinical treatment for reperfusion injury; the cited civilian guidance supports calling for help, releasing the force when safe, controlling external bleeding, and monitoring until professional care takes over.
If a tourniquet has been applied, keep it in place, note the application time, and tell arriving responders when and where it was placed. Do not loosen it to “give the limb a break.” If a dressing becomes soaked or bleeding restarts, tell the dispatcher and follow instructions rather than repeatedly removing dressings.
What should you tell the emergency dispatcher?
Give the dispatcher the information needed to locate the casualty, understand immediate threats, and guide you until responders arrive. Stay on the line if asked, and put the call on speakerphone when feasible so you can continue helping.
- The exact site address, entrance, and safest route to the casualty.
- What is trapping or compressing the person and whether the force remains in place.
- Whether there is severe bleeding, where it is coming from, and what pressure or other first aid has been applied.
- Whether the person is responsive and breathing, and any change in their condition.
- Any safety issue that prevents you or responders from reaching the casualty.
- If a tourniquet is used, its location and the time it was applied.
Do not hang up just because the crushing force has been removed or the bleeding appears to stop. A crush injury still needs urgent assessment, and the dispatcher can advise what to do next.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common mistakes to avoid
- Entering an unsafe area. A second injured person cannot help the casualty. Wait for a safe approach and tell the dispatcher about access problems.
- Delaying release for a routine tourniquet. ANZCOR does not recommend routine pre-release tourniquet use to prevent reperfusion injury. Its specific allowance is for actual or anticipated life-threatening limb bleeding, provided application does not delay release.
- Using a tourniquet for the wrong kind of wound. The cited guidance concerns life-threatening bleeding from an extremity; a tourniquet is not a general-purpose treatment for every wound.
- Loosening a tourniquet after bleeding stops. RCUK’s public instructions say not to release it while awaiting care. Note the time and let responders manage removal.
- Stopping at the first sign of improvement. Less bleeding or a person who seems calm does not rule out serious injury. Keep monitoring and arrange hospital care.
- Trying a technique outside your training. Wound packing has specific uses, and tourniquet placement guidance differs by jurisdiction. Use dispatcher instructions and local training rather than improvising.
- Leaving the casualty alone without a handoff. If you must move away for safety or to guide responders, make sure someone else can continue watching the person and communicating changes.
Which guidance applies where you are?
The sources cited here come from Australia and New Zealand, the United States, and the United Kingdom. Their core priorities align—call early, make the scene safe, control severe external bleeding, and get professional care—but some detailed instructions, particularly tourniquet placement, are jurisdiction-specific.
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Use your local emergency number, first-aid training, and dispatcher directions. ANZCOR’s crush-injury guidance is especially relevant to the timing of release and tourniquet use; the UK public instructions provide the cited 5–7 cm placement detail; the AHA and American Red Cross guideline supports the broader bleeding-control options. None replaces emergency response or hospital assessment.
Frequently Asked Questions
Can a person be seriously injured by a crush incident if there is no visible wound?
Yes. A crush injury can have serious internal consequences even when external signs are limited. Report the compression to emergency services and seek urgent hospital assessment rather than relying on appearance.
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Call emergency services early and use speakerphone if you can do so safely, so you can hear instructions while staying available to help. If you cannot safely reach or release the person, explain that clearly to the dispatcher instead of attempting a dangerous rescue.
Should I move a heavy object myself to free someone?
Only remove the crushing force when doing so is safe and physically possible. Do not attempt an unstable or impossible lift; tell the dispatcher what is trapping the person and follow their directions.
Should I put on a tourniquet before releasing the crushing force?
Not routinely. ANZCOR says a tourniquet may be used before or immediately after release for actual or anticipated life-threatening limb bleeding, but only if application does not delay safe release. Follow dispatcher instructions and your training.
How high above the wound should a tourniquet go?
Resuscitation Council UK’s public instructions specify 5–7 cm above the injury and not over a joint. This is UK-specific guidance; use local training, device instructions, and dispatcher advice where you are.
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Bottom line: Make the scene safe, call emergency services, release the crushing force as soon as you safely can, and apply firm pressure to severe bleeding. Use a tourniquet only for life-threatening limb bleeding when appropriate, without delaying release; keep it in place, monitor the casualty, and ensure urgent hospital care.
