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What is an INR blood test?

April 26, 2017INR

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What is an INR blood test?

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This is a test derived from another, the prothombin ratio. It measures the extrinsic clotting pathway system, commonly used to measure warfarin (blood thinning) drugs. A normal, healthy person will have an INR of 1. In warfarin therapy, an INR is usually aimed for around 2.