PT/INR Monitoring

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PT/INR stands for Prothrombin Time & International Normalized Ratio. PT/INR is a measurement of extrinsic pathway of coagulation. Two million new people start taking the oral anticoagulant drug Coumadin® (warfarin) every year to prevent blood clots, heart attacks and stroke. Correct dosing of Coumadin is determined for each patient by periodically measuring blood clotting time using the prothrombin time (PT) test.