How long can a tourniquet be in place before it is considered for conversion?

A tourniquet can be in place for up to 6 hours before conversion is considered. The rationale behind this time frame is based on the body's physiological response to ischemia—where blood flow is restricted. If a tourniquet is applied for longer than the established safe duration, there is a heightened risk of permanent tissue damage due to the lack of blood supply. The 6-hour timeframe is a standard guideline that balances the need to control severe bleeding while minimizing the risks associated with prolonged tourniquet usage.

This duration has been informed by battlefield medicine experiences and studies that have assessed the consequences of prolonged ischemia in extremities. After this period, medical professionals should evaluate the situation to assess the viability of the limb and consider alternative bleeding control methods or other interventions.