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Prothrombin, INR blood test
What it measures
Thrombus Formation and Blood Clotting
Clinical significance
Prothrombin is a protein produced by your liver. It is one of many factors in your blood that help it to clot appropriately.
Prothrombin time test results can be presented in two ways.
As INR:
In healthy people an INR of 1.1 or below is considered normal. An INR range of 2.0 to 3.0 is generally an effective therapeutic range for people taking warfarin for disorders such as atrial fibrillation or a blood clot in the leg or lung.
In seconds:
The average time range for blood to clot is about 10 to 13 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.
What if prothrombin time is high?
When the PT is high, it takes longer for the blood to clot (17 seconds, for example). This usually happens because the liver is not making the right amount of blood clotting proteins, so the clotting process takes longer. A high PT usually means that there is serious liver damage or cirrhosis.
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