What does the medical abbreviation INR mean?

Answer 1

The INR, or international normalized ratio, is a measure of blood clotting time. To calculate it, you divide the prothrombin time of the patient's sample by the prothrombin time of a standard sample from the manufacturer to get a ratio (i.e. a unitless measure). A factor is applied to the result to account for differences in the manufacturer's samples so that INRs are comparable from lab to lab.

The INR is used to measure clotting time in people on warfarin (Coumadin) to make sure that they're taking enough to prevent clots from forming. The INR also can become abnormal in certain types of liver disease or blood diseases.
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International normalized ratio
is inrtest sold in Greece