What is the correct procedure for using a tourniquet?

The proper procedure for using a tourniquet involves applying it above the injury site until the bleeding stops. This technique is essential because the purpose of the tourniquet is to occlude blood flow to the affected limb, thereby controlling life-threatening hemorrhage. By placing the tourniquet above the injury, you're effectively preventing blood from flowing to the wound, which can significantly reduce the risk of shock and potential fatality due to excessive blood loss.

The necessity for tightening the tourniquet until bleeding is controlled is critical, as inadequate pressure may not stop the hemorrhage, leaving the patient at risk. Moreover, leaving a tourniquet loose can allow blood flow, which defeats its purpose and can lead to severe complications. After applying the tourniquet and ensuring it is tightly secured, it should be marked with the time it was applied to provide information for receiving medical personnel.

Taking all these factors into account makes this choice the most appropriate and safe procedure for using a tourniquet in emergency situations.