PROTHROMBIN TIME; PT INR

What this test checks

Measures clotting time and reports it as INR. Used to check liver function and to monitor warfarin therapy.

Why do people get this test?

Essential for anyone on warfarin and for liver disease evaluation.

When you should consider this test

• On warfarin blood thinner
• Liver disease evaluation
• Easy bruising or bleeding

How to prepare

Take your usual warfarin dose. No fasting needed.