When is it appropriate to use a tourniquet?

Using a tourniquet is appropriate specifically in cases of severe bleeding from an arm or leg when other methods, such as direct pressure, have not been successful in controlling the blood loss. This is crucial because a tourniquet can effectively stop blood flow to the limb, thereby preventing further blood loss and mitigating the risk of shock or death due to hemorrhage. It is not suitable for minor wounds or puncture wounds, where less invasive methods of control should be prioritized. Employing a tourniquet unnecessarily, especially for minor cases, can lead to complications such as tissue damage, so understanding the proper indications for its use is vital for effective first aid response.