When should a tourniquet be applied?

A tourniquet should be applied when the casualty has severe bleeding or a limb amputation because it is a critical tool in managing life-threatening hemorrhages. In situations where a person is experiencing uncontrolled bleeding, especially from an extremity or where an amputation has occurred, a tourniquet serves to cut off blood flow to that area. This can significantly reduce the risk of death from blood loss and stabilize the casualty until they can receive definitive medical care.

Applying a tourniquet is a life-saving measure that is particularly relevant in emergency and combat situations where quick action can mean the difference between life and death. While it's essential to monitor for the signs of severe bleeding during tactical field care and ensure that medical attention is sought, the immediate application of a tourniquet takes precedence in cases of extreme blood loss or limb trauma. This emphasizes the importance of knowing when to use such a device effectively.