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PT/INR (Prothrombin Time and International Normalized Ratio)

Also Known As: PT, Pro Time, Protime, INR

A prothrombin time (PT) is a test used to help detect and diagnose a bleeding disorder or excessive clotting disorder; the international normalized ratio (INR) is calculated from a PT result and is used to monitor how well the blood-thinning medication (anticoagulant) warfarin (Coumadin®) is working to prevent blood clots.
Could be used if you are taking warfarin or when you have unexplained or prolonged bleeding or inappropriate blood clotting.