PT / INR

PT

Prothrombin time (PT) is a blood test that measures the time it takes for the liquid portion (plasma) of your blood to clot.

The most common reason to perform this test is to monitor your levels when you are taking a blood-thinning medicine called warfarin.

You may also need this test to:

• Find the cause of abnormal bleeding or bruising
• Check how well your liver is working
• Look for signs of the blood clotting or bleeding disorder