Figure 3.

The coagulation pathways and thrombosis. The bleeding time is a screening test for the arterial phase of hemostasis. Three in vitro tests are used to measure the time elapsed from activation of the intrinsic, extrinsic, and common pathways of the coagulation system. Commonly used tests for arterial thrombosis are as follows—prothrombin time (PT), activated partial prothrombin time (APTT), and thrombin time (TT). Similarly, three in vitro predictive tests are used for the venous phase of hemostasis. Tests used to diagnose or rule out DVT include: D-dimer blood test and CRP levels, fibrinolytic testing, and urinary thromboxane test.