What is the purpose of a tourniquet in first aid?

The primary purpose of a tourniquet in first aid is to stop severe bleeding, particularly in situations where direct pressure is not effective, or when immediate medical assistance is unavailable. When applied correctly, a tourniquet occludes blood flow to a limb, which can be critical in preventing exsanguination, where a person loses a life-threatening amount of blood. This is especially important in traumatic injuries where arteries may be severed or compromised, leading to rapid blood loss. Tourniquets are designed to be tightened until the bleeding stops, and they play a vital role in managing life-threatening injuries and stabilizing patients until they can receive more comprehensive medical treatment.

While pain reduction, stabilization of broken bones, and prevention of shock are also crucial aspects of first aid, they do not directly relate to the specific function of a tourniquet.