What is the primary purpose of using a tourniquet?

The primary purpose of using a tourniquet is to control severe bleeding. When a tourniquet is applied to a limb, it creates a constriction that significantly reduces or completely stops blood flow to the area beyond the point of application. This is especially critical in situations where a person is experiencing life-threatening hemorrhaging due to traumatic injuries. By effectively controlling the bleeding, a tourniquet can help stabilize the patient and increase the chances of survival until more definitive medical care can be administered.

In emergency situations where excessive blood loss can lead to shock or death, the timely use of a tourniquet is paramount. It allows for immediate control of a bleeding wound, which is vital in preserving the patient's life. Other choices, while they may relate to various first aid measures, do not capture the essential function of a tourniquet in emergency medicine.