Clarilab

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PT/INR test

Also called prothrombin time, INR

How long your blood takes to clot.

Typical range
INR about 0.8–1.2 (2–3 on warfarin).

Why it's done

Before surgery, with liver disease, and to adjust blood thinners such as warfarin.

What a high result can mean

Slower clotting: blood thinners, liver disease or low vitamin K.

Got a report with PT/INR?

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More other tests

D-dimerA fragment released when a clot breaks down. Amylase and lipaseEnzymes from the pancreas.