Bleeding control

Uncontrolled hemorrhage is the leading cause of preventable death in trauma — accounting for roughly 90% of preventable combat fatalities and a significant proportion of civilian trauma deaths. A person with a severed femoral artery can bleed to death in under three minutes. The bystander who acts in the first two minutes saves more lives than any hospital intervention that follows. These skills are for that person.

Educational use only

This page provides general educational information for emergency preparedness scenarios when professional medical care is unavailable. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider. Use this information at your own risk.

Bleeding classification

Not all bleeding is equal. Knowing what you are looking at determines your response in the first 30 seconds.

Arterial bleeding: Bright red, oxygen-rich blood. Characteristically spurts or pulses in rhythm with the heartbeat. Even a small arterial bleed can be rapidly fatal if the vessel is large. The femoral artery (groin/thigh), brachial artery (upper arm), popliteal artery (behind the knee), and radial/ulnar arteries (wrist) are the most commonly injured in trauma. A tourniquet is indicated for arterial bleeding on a limb — do not waste time on direct pressure alone.

Venous bleeding: Dark red, deoxygenated blood. Flows continuously and steadily rather than pulsing. Still serious but more controllable with pressure. Venous bleeding from large veins (femoral vein, jugular vein) can be rapidly fatal, but most venous bleeding from extremity wounds responds to sustained direct pressure.

Capillary bleeding: Slow seep from the wound surface. Bright red but very low volume and pressure. This is the bleeding from abrasions, minor cuts, and surface lacerations. It almost always stops spontaneously with simple pressure.

Internal bleeding: Not visible externally. Signs include distension of the abdomen, bruising over the flank (indicating kidney or aortic injury), a rapidly expanding thigh without external wound (indicating femoral vessel or femur fracture), and progressive shock signs (pale, cold, confused, weak rapid pulse) without visible bleeding. Internal abdominal and thoracic hemorrhage cannot be managed in the field — recognition and rapid evacuation are the only interventions. See shock for the full shock management protocol.

The three-zone decision framework

Bleeding zone	Description	First response
Extremity	Arm, leg — below shoulder and hip	Tourniquet first for arterial or massive bleed
Junctional	Groin, axilla (armpit), neck, shoulder	Wound packing — tourniquet cannot be placed here
Truncal	Chest, abdomen, back	Packing if accessible; stabilize and evacuate

Direct pressure

Direct pressure is the correct first intervention for most wounds that are not life-threatening limb hemorrhage. It is also the preparation step before deciding whether to escalate to packing or tourniquet.

When direct pressure is appropriate

Venous bleeding from any location
Moderate soft tissue bleeding from the trunk, face, or scalp
Extremity bleeding where arterial involvement is uncertain
Any wound in a junctional area (groin, armpit) as the primary method

Technique

Expose the wound — cut or tear clothing away. You cannot control bleeding through fabric.
Put on gloves if available. If not, use the victim's own hands to apply initial pressure while you prepare.
Fold two or three gauze pads together into a firm pad. If gauze is unavailable, use the cleanest available cloth — a shirt, bandana, or folded towel.
Place the pad directly on the wound and apply firm, continuous pressure using the heel of both hands stacked on top of each other.
Press hard. Most people who apply "pressure" use about 10% of the force required. The landmark for adequate pressure: you should be pressing with enough force that your own arms fatigue within a few minutes. For a head wound, use firm pressure. For a thigh wound, use your full body weight leaning through your arms.
Maintain continuous, uninterrupted pressure for a full 10 minutes without lifting the pad to check. Looking at the wound every 30 seconds breaks the forming clot and restarts the bleeding clock.
At 10 minutes, gently lift the pad. If bleeding has stopped or significantly slowed, add a second dry pad over the first (do not remove the original — the clot is attached to it) and secure with a circumferential wrap.
If bleeding has not slowed after 10 minutes of correct technique, escalate to wound packing (for accessible deep wounds) or tourniquet (for extremity wounds).

Checking too soon is a common fatal error

The most common mistake in bleeding control is lifting the dressing to check progress. Each time you lift, you disrupt the clot forming at the wound. Studies of trauma first aid failures frequently cite early dressing removal as the reason direct pressure failed. Set a timer. Do not lift. If blood saturates through, add more material on top and press harder.

Wound packing

Wound packing is indicated when a wound is deep and cannot be closed by surface pressure alone, when the wound is in a junctional area where tourniquets cannot be applied, or when direct pressure has failed after 10 minutes on a deep wound. Packing fills the wound cavity with material that creates a pressure tamponade against the bleeding vessel.

Equipment

Hemostatic gauze (Combat Gauze, QuikClot, Celox) is the military standard and preferred when available. Combat Gauze is impregnated with kaolin clay, which activates Factor XII in the clotting cascade and accelerates clot formation. Celox uses chitosan. Both work significantly faster than plain gauze and are the CoTCCC (Committee on Tactical Combat Casualty Care) hemostatic dressing of choice.

Plain gauze: Works well when hemostatic gauze is unavailable. The mechanism is purely mechanical — packing creates pressure, and sustained pressure causes clotting. It requires longer pressure application (5+ minutes versus 3 minutes for hemostatic gauze).

Do not use: Cotton balls, wadded tissue, sanitary pads without gauze, or non-sterile cloth as your packing material if better options exist. These materials can fragment inside the wound and are very difficult for surgeons to fully remove later.

Packing procedure

Put on gloves. If you need to use bare hands, do it — dying from infection later is better than dying from hemorrhage now.
Identify the deepest visible point of the wound cavity. This is where you start.
If using a roll of hemostatic gauze, keep it continuous — do not cut pieces. You want one continuous strip that the surgeon can pull out cleanly.
Press a folded portion of the gauze firmly into the deepest point of the wound with your finger. Use deliberate downward force — hesitant patting does not create tamponade.
Continue pressing gauze into the wound, feeding the roll in behind your finger and packing it tightly in layers. Fill the cavity from the deepest point upward until gauze is level with or slightly above the skin surface.
Once the cavity is filled, apply immediate, hard pressure with both hands on top of the packed wound. Use your full body weight if necessary.
Maintain hard pressure for 3 minutes with hemostatic gauze or 5 minutes with plain gauze. Do not reduce pressure during this window.
After the pressure hold, do not remove the packing. Apply a pressure dressing over the top — additional gauze secured with an elastic wrap or bandage — and maintain moderate pressure during transport.
Mark the time of packing application on the patient (permanent marker on the forehead or tourniquet card if available).

Field note

Proper wound packing requires genuine force. In training, most people pack too gently because packing a wound looks and feels aggressive. The feedback from a real packed wound is the feeling of firm resistance from tissue when each layer is fully compressed. If your finger goes straight in without resistance, you have not packed tightly enough. Pack until the cavity is genuinely filled and hard.

Packing junctional wounds

Junctional wounds (groin, axilla, neck junction at the shoulder) are the hardest to manage because tourniquets cannot reach these locations and the wound geometry often makes consistent pressure difficult to maintain.

For groin wounds: the femoral triangle is a deep space. Pack aggressively and maintain sustained pressure. Have the patient lie flat with the leg straight. Apply packing and then press down through the packing toward the femoral head (hip socket). If a second rescuer is present, one person maintains pressure while the other stabilizes the patient.

For axilla (armpit) wounds: pack the space and have the patient lower their arm over the dressing to create body-weight pressure on the wound. This is imperfect but extends the effectiveness of packing when direct pressure cannot be maintained.

Tourniquet application

A tourniquet is a circumferential compression device applied to a limb to completely stop blood flow distal to the wound. It is the fastest and most reliable intervention for life-threatening extremity hemorrhage and is appropriate as the first intervention for arterial limb bleeding — not as a last resort after direct pressure fails.

When to apply a tourniquet

Apply a tourniquet immediately (before direct pressure) when: - Arterial bleeding is present on an extremity — bright red, pulsing - Amputation or near-amputation with severe bleeding - Limb wound with bleeding that is clearly life-threatening in volume - Blast or high-energy trauma to a limb with uncontrolled hemorrhage

Apply a tourniquet when direct pressure fails when: - 10 minutes of firm direct pressure has not significantly controlled the bleed - Wound is too large or inaccessible for sustained pressure - Single rescuer must leave the patient temporarily

Do not apply a tourniquet for: - Junctional wounds (groin, axilla) — use packing - Truncal (chest, abdomen) wounds — pack and stabilize - Wounds that are adequately controlled by direct pressure

Equipment

Commercial tourniquets (CAT — Combat Application Tourniquet, SOFTT-W, TMT) are the standard of care. They are designed for one-handed application and have a windlass mechanism that allows the rescuer to tighten past initial resistance to true arterial occlusion.

Improvised tourniquets: A tourniquet improvised from a belt, cravat, or strip of cloth with a windlass stick can work in a complete absence of commercial equipment, but they fail at a much higher rate, are harder to tighten adequately, and slip. If you are building a preparedness kit, a commercial tourniquet is a high-priority, affordable addition — do not improvise when you can avoid it.

Application procedure (CAT or similar windlass tourniquet)

Expose the limb — cut or tear the sleeve or pant leg. Apply only to bare skin; applying over clothing reduces effectiveness.
Route the tourniquet around the limb 2–3 inches (5–7.5 cm) above the wound. If the wound location is unclear or if the wound is very high on the limb (mid-thigh or upper arm), apply the tourniquet as high on the limb as possible — directly in the groin or axilla crease.
Thread the strap through the buckle and pull it through until all slack is taken up. The strap should be snug before the windlass is engaged.
Twist the windlass rod until the bleeding stops completely — not just slows, but stops. This typically requires 3–5 full rotations and causes significant pain. If the patient tells you it hurts, that is expected. If the patient is conscious, explain what you are doing.
Lock the windlass rod into the retention clip or holder.
Secure the windlass clip with the hook-and-loop retention strap (if present on the device).
Write the time of application directly on the patient's skin with a permanent marker (recommended location: the patient's forehead) or on a tourniquet card. Write "TQ" and the time in 24-hour format. This is not optional — this information directly determines the treatment decisions at the hospital.
Do not cover the tourniquet. It must remain visible to receiving medical personnel.
Do not remove or loosen the tourniquet in the field once applied.

Tighten until bleeding STOPS — not until it slows

The most common tourniquet failure in civilian use is under-tightening. A tourniquet that reduces but does not stop blood flow creates venous congestion (blood pooling below the tourniquet) without stopping arterial flow — this is worse than no tourniquet at all. If you see oozing from the wound after tourniquet application, tighten further. If the windlass is already locked and bleeding continues, apply a second tourniquet immediately above the first.

Tourniquet time and tissue safety

Safe tourniquet duration based on Tactical Combat Casualty Care (TCCC) research:

Under 2 hours: Considered safe for healthy tissue. Conversion to other hemorrhage control methods should be evaluated during this window when definitive care is available.
2–4 hours: Increasing risk of nerve and muscle injury. Conversion should happen at the earliest safe opportunity with physician involvement.
4–6 hours: Significant tissue ischemia. Conversion without physician supervision and monitoring capability is not recommended.
Over 6 hours: Severe tissue injury likely. Amputation risk increases substantially. Do not convert without surgical capability available.

In a prolonged field care scenario where evacuation is unavailable and the tourniquet has been in place for more than 2 hours with no signs of continued major bleeding — re-assess carefully. Do not remove the tourniquet without physician guidance, but loosen it very slowly to assess whether hemorrhage control can be maintained with wound packing and direct pressure instead. If bleeding immediately resumes upon loosening, re-tighten and maintain.

MARCH protocol overview

The Massive hemorrhage, Airway, Respiration, Circulation, Hypothermia (MARCH) mnemonic is the tactical trauma care sequence from TCCC (Tactical Combat Casualty Care). It prioritizes interventions in the order they prevent death, which differs from the traditional first-aid "airway first" approach for trauma with hemorrhage.

M — Massive hemorrhage: Address life-threatening external bleeding first. Apply tourniquet for extremity arterial bleeding. Pack junctional wounds. Apply direct pressure for other wounds. This step happens before the airway assessment because hemorrhage kills faster than airway obstruction in most trauma scenarios.

A — Airway: Assess whether the patient has an open airway. A conscious, speaking patient has a patent airway. An unconscious patient needs their airway opened with a jaw thrust or head-tilt/chin-lift, or a nasopharyngeal airway (NPA) if available. Do not move a suspected spinal injury patient without log-roll technique.

R — Respiration: Assess breathing rate and depth. Normal rate for adults is 12–20 breaths per minute. Look for labored breathing, paradoxical chest movement (one side of the chest moving in when the other moves out — indicates tension pneumothorax or flail chest), or severe tracheal deviation. A sucking chest wound — where you hear or see air moving through a chest wall wound — requires an occlusive seal (see chest injuries).

C — Circulation: After hemorrhage is controlled, assess and support circulation. Check pulse (rate, strength, regularity). Treat for shock — see the shock prevention section below.

H — Hypothermia / Head injury: Prevent hypothermia (the lethal triad of trauma is hypothermia, acidosis, and coagulopathy — hypothermia makes all three worse). Cover the patient. Address significant head injury with monitoring for altered consciousness.

Shock prevention and management

Hemorrhagic shock occurs when blood volume drops enough that the heart cannot maintain adequate perfusion. Recognizing it early and supporting circulation while stopping bleeding is the field management sequence.

Signs of developing shock

Sign	Description
Skin color	Pale, gray, or mottled (blotchy)
Skin temperature	Cool, clammy skin — feel the back of the neck and inner arm
Mental status	Anxiety, confusion, combativeness, then unresponsiveness
Pulse	Rapid and weak — greater than 100 bpm, difficult to feel at the wrist
Capillary refill	Press the fingernail; color should return in under 2 seconds. Over 2 seconds indicates poor perfusion

Field management of shock

Lay the patient flat on their back. Do not leave a severely injured patient sitting up.
Unless head, neck, spinal, chest, or abdominal injury is suspected, elevate the legs 8–12 inches (20–30 cm) to shift blood volume toward the core.
Cover the patient with a blanket, emergency mylar blanket, or any available insulating material. Keep them warm. Hypothermia drastically impairs clotting — a cold, shocked patient bleeds worse.
Do not give fluids by mouth to an unconscious or semi-conscious patient — aspiration risk. For a conscious, alert patient without abdominal injury in a prolonged field care scenario (no evacuation possible for many hours), oral hydration with water or oral rehydration solution may be appropriate in small sips.
Do not apply heat directly — hot water bottles, heating pads, or open flame. Warming the skin dilates peripheral blood vessels and may redirect blood away from the core.
Monitor mental status every 5 minutes. Deteriorating mental status (increasing confusion, decreased responsiveness) indicates progressive shock.
Continue reassessing hemorrhage control — a tourniquet or packed wound that was controlled may fail and resume bleeding. Check the wound site or tourniquet with every round of monitoring.

Bleeding control kit

A dedicated bleeding control kit — sometimes called an IFAK (Individual First Aid Kit) or bleed kit — belongs in every home, vehicle, and workspace. For the full build, see ifak.

Item	Quantity	Function
Commercial tourniquet (CAT or SOFTT-W)	2	Life-threatening limb hemorrhage
Hemostatic gauze (Combat Gauze or Celox), 3-inch roll	2	Wound packing — junctional and deep wounds
Plain gauze rolls, 3-inch (7.5 cm)	4	Direct pressure; packing when hemostatic unavailable
Gauze pads, 4×4 inch (10×10 cm)	10	Direct pressure dressings
Israeli bandage or similar pressure dressing	2	Maintain pressure on controlled wounds during transport
Medical tape (1-inch (2.5 cm))	1 roll	Secure dressings
Nitrile gloves (paired)	4 pairs	Universal precautions
Emergency mylar blanket	1	Hypothermia prevention in shock
Permanent marker	1	Document tourniquet time
Trauma shears	1	Expose wounds quickly

Bleeding control readiness checklist

Assemble a bleeding control kit for home, each vehicle, and workplace
Practice tourniquet application until you can apply it correctly in under 60 seconds — practice on your own thigh, then on a training partner
Practice wound packing on a training manikin or practice wound pad until finger placement and pressure feel instinctive
Know the three-zone framework by memory: extremity = tourniquet first; junctional = packing only; truncal = pack and evacuate
Write today's date on your tourniquets and replace them every 3–5 years (rubber degrades)
Teach every household member to apply a tourniquet — the injured person cannot do it on themselves in most scenarios
Pair this training with wound care for post-hemorrhage wound management

Hemorrhage control is the rare preparedness skill where proper equipment and 20 minutes of practice genuinely saves lives. The techniques are not complicated. The challenge is the psychological freeze in a real bleeding emergency. Practice removes the freeze. Pair this page with shock for managing what comes after the bleeding stops, and wound care for the ongoing care of the wound site.