What is the definition or description of: partial thromboplastin time?

APTT: Ptt is a blood test that looks at how long it takes for blood to clot. It can help tell if you have bleeding or clotting problems. In general, clotting should occur between 25 - 35 seconds. If the person is taking blood thinners, clotting takes up to two and a half times longer. Alternative name is activated partial thromboplastin time.

Clotting test: The time required for clot formation in blood plasma after activation and addition of platelet particles such as phospholipids. The test called PTT or aptt is used to assess the coagulation pathways or clotting pathways in your blood. A prolonged aptt can indicate a deficiency of a component of the clotting pathways, such as factors xii, xi, ix, viii, x, v, and ii, and fibrinogen.