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Table of Contents > Health Dictionary > International normalized ratio

International normalized ratio

The prothrombin time ratio that would have been obtained if a standard reagent had been used in a prothrombin time determination; the prothrombin time ratio is expressed as the patient prothrombin time divided by the mean of the prothrombin time reference interval; the prothrombin time ratio is obtained for a working reagent in the laboratory through use of a parameter designated the international sensitivity index.
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