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The prothrombin time test belongs to a group of blood tests that assess the clotting ability of blood. The test is also known as the pro time or PT test.
Freebase(0.00 / 0 votes)Rate this definition: Prothrombin time. The prothrombin time and its derived measures of prothrombin ratio and international normalized ratio are measures of the extrinsic pathway of coagulation. This test is also called ProTime INR and PT/INR.