Coagulation tests are used to evaluate and diagnose bleeding problems. They are also used to monitor people taking warfarin or other anticoagulants. There are many different coagulation tests, and the choice depends on the circumstances and suspected problem.

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.