About Prothrombin Test: Prothrombin Time PT with INR

This test measures blood clotting factors by determining the following: activated partial thromboplastin time; INR; and prothrombin time (PT).

The Prothrombin Test: Prothrombin Time PT with INR is a laboratory test. Your health care provider can explain what it measures and whether it is appropriate for your situation.

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How to prepare

Most lab tests require a blood or other sample. Follow any instructions given by your healthcare provider or the testing laboratory. Tell your provider about medications, supplements, or recent illnesses that might affect results.