APTT (Partial Thromboplastin Time)

APTT, or Activated Partial Thromboplastin Time, is a laboratory test that measures the time it takes for blood to clot by assessing the intrinsic and common pathways of the coagulation system. It is commonly used to diagnose bleeding disorders, such as hemophilia, von Willebrand disease, or liver disease, and to monitor patients on heparin therapy (a blood thinner). Prolonged APTT results may indicate a deficiency or dysfunction in clotting factors, while shorter times may suggest risk of excessive clotting. This test is crucial in pre-surgical evaluations and in managing conditions related to abnormal bleeding or clotting.