Partial thromboplastin time (PTT) measures the overall speed at which blood clots by means of two consecutive series of biochemical reactions known as the "intrinsic" (now referred to as the contact ...

A partial thromboplastin time (PTT) test is a blood test that helps doctors assess your body’s ability to form blood clots. Bleeding triggers a series of reactions known as the coagulation cascade.

Specific types of coagulation tests include: Prothrombin time (PT) Activated partial thromboplastin time (aPTT)‌ Thrombin time (TT) These studies help make sense of unexplained bleeding.

Some pathways call for “baseline laboratory studies,” including prothrombin time (PT), activated partial thromboplastin time (aPTT ... on factor X a in the coagulation pathway, which is ...

These factors form two cascades known as the intrinsic and extrinsic coagulation pathways. Both of these pathways lead to the formation of thrombin. The extrinsic pathway also facilitates the ...

The intrinsic coagulation pathway is initiated by contact activation on glass, silica, or kaolin (as in the activated partial-thromboplastin time [APTT], colloidal-silica clotting time [CSCT], and ...