A PT - Prothrombin Time test is a blood test that measures the time it takes for your blood to form a clot. Prothrombin is a protein made by the liver and helps your blood to clot appropriately. The Prothrombin Time blood test also helps to find out if the medicine that prevents blood clots is working the way it should. Please check the Prothrombin Time test price at the HOD centre near you.