What is the recommended action to take after applying a tourniquet?

The recommended action after applying a tourniquet is to mark the time it was applied. This is critical because knowing when the tourniquet was placed provides important information for medical personnel who will later treat the patient. Tourniquets are typically used in severe bleeding situations, and prolonged application can lead to tissue damage. By marking the time, healthcare providers can assess the risk of complications such as ischemia and plan their interventions accordingly.

Other actions, such as informing the victim of the action or calling for assistance, are also important but are secondary to ensuring that crucial information about the tourniquet's application time is documented. Removing the tourniquet immediately is not advisable, as it may lead to uncontrolled bleeding. Therefore, marking the time is the most critical step following the application of a tourniquet.