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Prothrombin time (PT) Prothrombin time (PT) is a blood test that measures the time it takes for the liquid portion (plasma) of your blood to clot. A related blood test is partial thromboplastin time (PTT). A blood sample is needed. If you are taking ant blood-thinning medicines, you will be watched for signs of bleeding.
If you have ever undergone oral anticoagulation therapy, you have most likely heard of the PT-INR test, but you may not understand what it is and/or what it means. This article will attempt to explain the PT-INR test. First let's talk about the PT test. PT stands for prothrombin time. It is a measure of how quickly blood clots. The traditional method for performing a PT test is to have your blood drawn and sent to a lab.