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Average prothrombin times range between 10 and 14 seconds . Results for patients taking warfarin, a blood thinner, are stated as the international normalized ratio, INR; the range is about 2.0 to 3.0 .
A prothrombin time (PT) is a another blood test done to help measure your INR. The higher your PT or INR, the longer your blood takes to clot. An elevated PT or INR means your blood is taking longer to clot than your healthcare provider believes is healthy for you .
If an INR is above the range, the patient’s blood is clotting too slowly. Doctors only use the INR for patients taking oral blood thinners, notes Mayo Clinic. Causes of high prothrombin time include blood thinners such as heparin, liver disorders, vitamin K deficiency and deficiencies in proteins required for clotting .
A low INR means your anticoagulation dose is too low and your blood is clotting too quickly . Some people might say your blood is “too thick.” This puts you at risk of developing conditions caused by a blood clot.