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What does INR tell you?

International normalized ratio (INR) is blood-clotting test. It is a test used to measure how quickly your blood forms a clot, compared with normal clotting time. A normal INR is 1.0. Each increase of 0.1 means the blood is slightly thinner (it takes longer to clot). INR is related to the prothrombin time (PT).

How to calculate INR?

The INR is derived from prothrombin time (PT) which is calculated as a ratio of the patient’s PT to a control PT standardized for the potency of the thromboplastin reagent developed by the World Health Organization (WHO) using the following formula: INR = Patient PT ÷ Control PT

How to check INR?

There are currently three different methods for checking INR: The traditional way: The patient goes to his or her doctor's office or to an anticoagulation clinic. Blood is drawn from a vein and sent to a lab. The physician's office using a point-of-care machine: The patient goes to his or her doctor's office or anticoagulation clinic.


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