Prothrombin time (PT) is a blood test that measures how long it takes for blood to clot. Prothrombin is one of several clotting factors your body makes to help your blood form clots when a blood vessel is damaged.
A PT test may also be called an INR test (for international normalized ratio).
The test can be used to check for bleeding problems. It is also used to check how well warfarin, a medicine to prevent blood clots, is working.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.
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Current as of: December 6, 2017
Adam Husney, MD - Family Medicine
& Martin J. Gabica, MD - Family Medicine & E. Gregory Thompson, MD - Internal Medicine
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