Final answer:
After applying a tourniquet to a severely bleeding injury, 'TK' and the exact time the tourniquet was applied should be written on adhesive tape and applied to the patient's forehead to inform medical professionals of the duration.
Step-by-step explanation:
When you apply a tourniquet to a patient who has sustained a severe injury causing significant bleeding, such as having a hand nearly severed by a drill press, it is essential to mark the time the tourniquet was applied. Therefore, after applying a tourniquet, you should write 'TK' and the exact time applied on a piece of adhesive tape and apply it to the patient's forehead. The acronym 'TK' stands for tourniquet, and noting the time is crucial because leaving a tourniquet on for too long can cause tissue damage. This helps ensure that medical professionals caring for the patient are aware of how long the tourniquet has been in place.