APTT test or activated partial thromboplastin time test is one of the hematological tests performed during routine health check-ups, liver function tests, blood clotting disorders or mandatory tests before surgery.

When an accident occurs that damages or ruptures a blood vessel, the clotting and hemostasis processes occur rapidly to respond and tightly control the damaged area.

The principle of treating vascular injuries is to provide first aid properly and quickly to maintain the patient's vital functions. First aid for vascular injuries must be urgent and quick, because the longer it is left or delayed, the more blood will be lost, and over time, more blood will be lost, leading to shock and death for the injured person.