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International Normalized Ratio (INR)

Description:

Patients on oral anticoagulation therapy (coumarins) have their therapy monitored by following the prothrombin time (PT). Because patients may be seen at several medical facilities, results must be comparable. Due to variation in thromboplastin reagent, methodology and instrumentation, variation in results can occur based on the procedure itself, rather than reflecting a true variation in the patient's state of anticoagulation.

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