prothrombin time (PT) test measures how long it takes for a clot to form in a blood sample. An INR (international normalized ratio) is a type of calculation based on PT test results.
Prothrombin is a protein made by the liver. It is one of several substances known as clotting (coagulation) factors. When you get a cut or other injury that causes bleeding, your clotting factors work together to form a blood clot. How fast your blood clots depends on the amount of clotting factors in your blood and whether they’re working correctly.
If your blood clots too slowly, you may bleed too much after an injury. If your blood clots too fast, dangerous clots may form in your arteries or veins.
A PT/INR test helps diagnose the cause of bleeding or clotting disorders. It also checks to see if a medicine that prevents blood clots is working the way it should.
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