After applying a tourniquet, what additional step must be performed?

Marking the time of application is an essential step after applying a tourniquet because it provides critical information for medical personnel who will evaluate and treat the casualty later. The duration for which a tourniquet has been in place can significantly influence patient outcomes.

If the tourniquet is left on for too long, it can cause significant damage to the limb due to restricted blood flow. The time noted helps healthcare providers assess the risk of potential complications such as limb loss or tissue death when planning further medical intervention. This practice aligns with standard protocols in trauma care and helps ensure that the casualty receives appropriate and timely medical treatment after initial stabilization.

It's important to understand that other actions, while beneficial, do not replace the necessity of marking the time. For example, checking for circulation would typically not be effective after a tourniquet has been applied, as the intent of the tourniquet is to stop blood flow entirely, which would render such checks unhelpful. Additionally, loosening the tourniquet or providing water could exacerbate the situation rather than contribute to effective trauma management. Hence, the correct step following the application of a tourniquet is to mark the time, ensuring that all details are recorded for future medical response.