International Normalized Ratio
The international normalized ratio (INR) system is viewed as the best means of standardizing measurement of prothrombin time to monitor oral anticoagulant therapy. It isn't used as a screening test for coagulopathies.
Procedure and posttest care
Normal INR for those receiving warfarin therapy is 2.0 to 3.0. For those with mechanical prosthetic heart valves, an INR of2.5 to 3.5 is suggested.
Increased INR values may indicate disseminated intravascular coagulation, cirrhosis, hepatitis, vitamin K deficiency, salicylate intoxication, uncontrolled oral anticoagulation, or massive blood transfusion.
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