External bleeding and catastrophic haemorrhage

How to control external bleeding using direct pressure, dressings, wound packing and tourniquets, and when 'life-threatening' bleeding needs urgent 999 help.

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How to guide

What is bleeding & catastrophic haemorrhage?

External bleeding occurs when blood escapes from damaged blood vessels through a wound in the skin; this can range from minor cuts and grazes to life-threatening haemorrhage where blood loss is so rapid that circulation and oxygen delivery to vital organs fail. First aid aims to protect yourself, expose and assess the wound, apply firm direct pressure and use appropriate dressings or equipment to slow and stop the bleeding until definitive care is available.

‘Catastrophic’ or ‘life-threatening’ bleeding is typically rapidly flowing or spurting blood that cannot be controlled quickly with simple pressure, major limb or junctional wounds, or multiple injuries, and it requires immediate, decisive action including wound packing and tourniquet use where trained and equipped to do so. Early identification and control of catastrophic haemorrhage is now emphasised ahead of airway in some trauma protocols because a casualty can bleed to death before airway problems develop.

Severe external bleeding can cause death within minutes if not controlled, and modern UK guidance recognises that in some high-risk environments first aiders may need tourniquets and haemostatic dressings in addition to direct pressure.

Who needs this skill?

Any organisation whose staff or service users may be exposed to machinery, knives, weapons, falls from height, road traffic collisions or crowd violence should consider the risk of life-threatening bleeding and ensure appropriate kits and training are in place.

Health & Social Care

In health and social care, catastrophic bleeding is more likely in specific contexts such as self-harm, vascular access complications, surgery or major trauma presentations; services should have clear escalation pathways and equipment such as major haemorrhage packs in hospital, while community teams need practical training in scene safety, direct pressure and seeking urgent help.

Licensed venues & nightlife

In licensed venues, events and nightlife settings, knife injuries, glass wounds, crush injuries and terrorist incidents can all result in catastrophic bleeding in crowded, noisy environments; training front-of-house and security teams to recognise life-threatening bleeding and use venue bleed kits quickly can buy crucial minutes before paramedics reach the casualty.

Schools

Schools must plan for serious injuries from tools, glass or assaults, not just grazes; having staff who can control major bleeding and call 999 rapidly is part of realistic emergency preparedness.

Workplaces

In workplaces such as construction, agriculture, forestry, manufacturing and remote sites, HSE now expects employers to consider 'life-changing bleeding' in their first aid needs assessment and, where relevant, provide appropriate additional kit such as tourniquets, wound-packing materials and haemostatic dressings alongside conventional first aid supplies. Staff identified to use this equipment should receive specific training so they can act confidently under pressure.

How to manage bleeding & catastrophic haemorrhage

These steps show how to control heavy bleeding quickly and when to escalate to tourniquets or haemostatic dressings within your training.

Check for dangers and call 999

Quickly assess the scene for dangers such as weapons, traffic or ongoing violence and do not put yourself at unnecessary risk. If you suspect life-threatening bleeding, ask someone to call 999 immediately or do it yourself on speakerphone while you begin first aid.

Catastrophic bleeding is always a 'call 999 now' situation, not 'wait and see'.

Expose and assess the wound

Use gloves or improvised barriers if available, expose the wound by cutting or removing clothing and look for the main source of bleeding, checking for any objects embedded in the wound that must not be removed.

Look for rapidly flowing, pooling or spurting blood, saturated clothing and multiple wounds, which suggest life-threatening haemorrhage.

Apply firm direct pressure

For most external bleeding, place a sterile dressing or clean pad directly over the wound and apply firm, steady pressure with your hands, asking the casualty or bystanders to help if possible and raising the limb if that does not cause more pain.

Keep continuous pressure for at least several minutes; if blood soaks through, add more dressings on top rather than removing the original pad.

Pack the wound if bleeding is heavy and deep

If bleeding is from a deep wound in a limb or junctional area and does not respond to direct pressure, and you are trained and equipped, push haemostatic gauze or clean cloth firmly into the wound cavity to compress the bleeding vessels, then maintain strong pressure over the packed wound.

Continue to hold pressure while monitoring the casualty's responsiveness and breathing and until emergency help takes over.

Apply a tourniquet for uncontrollable limb bleeding

For catastrophic limb bleeding that cannot be controlled with direct pressure and wound packing, or when there are multiple casualties and you cannot maintain pressure, apply a commercial tourniquet 5-7 cm above the wound, between the wound and the body, avoiding joints like elbows and knees.

Tighten the tourniquet until bleeding stops or is significantly reduced and secure it; record the time of application and do not remove or loosen it until instructed by emergency personnel.

This guide is a learning reference only. It does not replace attended, assessed first aid training.

Qualifying courses

These courses address recognition and management of external bleeding, with some also covering catastrophic haemorrhage, wound packing and tourniquet use where appropriate to the workplace risk and course level. Choose the course that matches your role, sector, and the level of clinical practice required.

Common questions

Practical answers for employers, venue managers, and healthcare teams about bleeding & catastrophic haemorrhage training.

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A black medical tourniquet with a windlass rod, hook-and-loop strap, and a white Velcro tab. The end of the strap has a red tip, indicating the section to pull for tightening. The background is plain white. - on localmedic

What is the difference between normal and ‘catastrophic’ bleeding?

Normal external bleeding from small cuts or grazes usually stops with simple direct pressure and a dressing, whereas catastrophic or life-threatening bleeding involves very heavy, fast blood loss that does not respond quickly to basic pressure and can lead to shock and death within minutes. First aiders should treat rapidly flowing, pooling or spurting blood as life-threatening and act urgently to control it and call 999.

When should a tourniquet be used in first aid?

Current guidance suggests that tourniquets should only be used by trained people for severe limb bleeding that cannot be controlled by direct pressure and appropriate dressings, or where maintaining pressure is not possible due to the situation or number of casualties. They should be placed above the wound on the limb, tightened until bleeding stops and left in place until removed by emergency services, as inappropriate application can cause harm.

Are haemostatic dressings and bleed kits required in all workplaces?

HSE does not require haemostatic dressings or tourniquets in every workplace, but updated guidance advises employers to consider the risk of ‘life-changing bleeding’ in their first aid needs assessment, particularly in sectors such as construction, agriculture, forestry, remote work and large public events. Where the risk is significant, additional bleed-control equipment and specific training may be necessary alongside standard first aid kits.

What should I do if there is an object stuck in the wound?

If there is a large object such as a knife or piece of glass still in the wound, do not remove it because it may be helping to limit bleeding and removal can cause catastrophic haemorrhage. Instead, apply pressure around the object, build up dressings on either side to keep it stable and control bleeding, and wait for emergency services to manage removal in a controlled setting.

Can I be held liable for using a tourniquet or wound-packing in an emergency?

UK bystander protection and ‘Good Samaritan’ principles, along with professional guidance, are generally supportive of people who act in good faith to provide first aid in an emergency, even when using equipment such as tourniquets or haemostatic dressings within their training. Employers can further reduce anxiety by providing clear protocols, training and post-incident support so staff know they will be backed when they follow agreed procedures.