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A prothrombin time test tells you how long it takes your blood to clot. Learn what it looks for, when you might need one, and what the results mean.


The prothrombin time (PT) – along with its derived measures of prothrombin ratio (PR) and international normalized ratio (INR) – are assays evaluating the extrinsic pathway and common pathway of coagulation.This blood test is also called protime INR and PT/INR.They are used to determine the clotting tendency of blood, in the measure of warfarin dosage, liver damage, and vitamin K status.


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).


Prothrombin time test results can be presented in two ways. In seconds. The average time range for blood to clot is about 10 to 14 seconds. A number higher than that range means it takes blood longer than usual to clot. A number lower than that range means blood clots more quickly than normal. As INR


The prothrombin time (PT) is a test used to help diagnose bleeding or clotting disorders. The international normalized ratio (INR) is a calculation based on results of a PT that is used to monitor treatment with the blood-thinning medication warfarin (Coumadin®).


Prothrombin time (PT) is a blood test that measures how long it takes blood to clot. A prothrombin time test can be used to check for bleeding problems. PT is also used to check whether medicine to prevent blood clots is working. A PT test may also be called an INR test.


What Causes High Prothrombin Time? High prothrombin time is caused by blood-thinning drugs such as warfarin, a lack or limited level of blood clotting factors and inhibitor substances. Alteration in the activity of one or more clotting factors and increased use of clotting factors also increase prothrombin time.


Introduction: This information shows the various causes of Increased prothrombin time, and how common these diseases or conditions are in the general population.This is not a direct indication as to how commonly these diseases are the actual cause of Increased prothrombin time, but gives a relative idea as to how frequent these diseases are seen overall.


A prothrombin time (PT) test measures the time it takes for the liquid portion of your blood to clot. This liquid portion of the blood is called plasma. Clotting refers to the formation of the blood and proteins into a solid mass to stop bleeding. Sometimes this test is called an INR (International Normalized Ratio) or ProTime test. Why is a ...


The normal blood protime and INR is: PT between 10–13 seconds is normal this corresponding to International normalized ratio (INR) between 1.0–1.4 as International normal range of INR For The warfarin (Coumadin) patients prothrombin time should be adjusted to be about 1.5 to 2.5 times the normal value (or INR values 2 to 3).