How to Apply a Tourniquet: Step-by-Step Field Guide

When to Use a Tourniquet

A tourniquet is for life-threatening bleeding from an arm or leg that you cannot stop with direct pressure. Situations include:

• Arterial bleeding (bright red, pulsing or spurting)
• Traumatic amputation
• Multiple wounds on the same limb
• Bleeding that soaks through direct pressure bandages
• Mass casualty events where you cannot hold pressure on every patient

Do not use a tourniquet for:

• Bleeding you can control with direct pressure and a bandage
• Wounds on the torso, neck, or head (use wound packing instead)
• Minor cuts or lacerations

The decision threshold is simple: if blood is pooling on the ground or the patient is showing signs of shock (pale, confused, rapid breathing), apply a tourniquet immediately. Speed saves lives.

Choosing a Tourniquet

Not all tourniquets are equal. The following are combat-proven and recommended by the Committee on Tactical Combat Casualty Care (CoTCCC):

• CAT (Combat Application Tourniquet) by North American Rescue. The most widely issued military tourniquet. One-handed application possible.
• SOF-T Wide by Tactical Medical Solutions. Metal windlass, wider strap. Extremely durable.
• SAM XT by SAM Medical. Newest generation, auto-locking buckle.

Correct Placement

High and tight is the modern doctrine for combat scenarios where you cannot visually assess the wound location (clothing, darkness, stress). Place the tourniquet as high on the limb as possible.

For civilian scenarios where you can see the wound, place the tourniquet 2-3 inches above the bleeding site. If the wound is at or near a joint, place the tourniquet above the joint.

Key rules:

• Never place directly on a joint
• Never place on the forearm or lower leg if you can avoid it (two bones make it harder to compress the artery)
• Over clothing is acceptable in emergencies. Do not waste time removing gear.
• If one tourniquet does not stop the bleeding, apply a second one directly above the first

Common Mistakes

1. Not tightening enough. A tourniquet that restricts venous flow but not arterial flow makes bleeding worse. Tighten until bleeding stops completely. It will hurt.
2. Placing it too close to the wound. If the tourniquet is too close, it may not compress the artery proximal to the injury. Leave 2-3 inches of clearance.
3. Loosening it to check. Once applied, leave it alone. Only trained medical personnel remove tourniquets.
4. Not noting the time. Write "TQ" and the time on the patient visibly. Surgeons need this information.
5. Using improvised tourniquets. Belts, shoelaces, and torn fabric rarely work. They are too narrow, cannot generate enough pressure, or slip. Carry a real tourniquet.

After Application

Once the tourniquet is on and bleeding is controlled:

1. Keep the patient warm (shock causes hypothermia)
2. Elevate the injured limb if possible
3. Monitor for continued bleeding below the tourniquet
4. Reassure the patient. Explain what you did and why.
5. Call 911 or evacuate to the nearest trauma center
6. Do not give food or water (the patient may need surgery)

The golden window is two hours for tourniquet time before tissue damage risk increases significantly. Modern evidence shows functional outcomes are good even at four hours. Do not let time anxiety prevent you from applying one.

Training Matters

Reading this guide is step one. Hands-on practice is essential. Take a Stop the Bleed course. They are free, run 60-90 minutes, and are offered at hospitals, fire stations, and community centers nationwide. You will practice on realistic training simulators until the steps become muscle memory.

In a real emergency, your hands will shake, your vision will narrow, and your brain will fight you. Training is what gets you through it.