What Is the Normal Therapeutic INR Range for a Patient?


Quick Answer

A normal international normalized ratio, or INR, in a healthy adult is between 0.8 to 1.2, states National Institutes of Health, Medline Plus. The INR is a derivative of the prothrombin time, which is a measure of blood-clotting time. The higher the INR, the longer it takes blood to clot.

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Full Answer

In a patient who is not being anti-coagulated with medication, a higher than normal international normalized ratio level raises concerns regarding advance liver disease. Since the liver impacts clotting factors, liver failure can elevate the international normalized ratio and prothrombin time.

Patients can have international normalized ratio levels raised therapeutically. Patients who have atrial fibrillation sometimes take the anticoagulant warfarin and set an INR goal that ranges between 2.0 and 3.0, notes Medline Plus. This elevated level reduces the change of a stroke, caused by clots coming from the heart.

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