The standard for monitoring warfarin therapy is

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INR is the standard for monitoring warfarin therapy.PT as a tool for monitoring warfarin therapy is problematic because thromboplastin reagents vary in their responsiveness to warfarin-induced reduction in clotting factors,a variability that depends on their method of preparation.INR is a mathematical correction of the results of the one-stage PT that standardizes the reporting of PT determinations worldwide.INR takes into account the sensitivity of the thromboplastin used in each specific laboratory to determine PT.The target INR range for warfarin in most clinical scenarios is 2 to 3.INR should be used exclusively to dose warfarin clinically;however,PT should be reviewed in conjunction with INR to aid in detecting laboratory errors in calculation or assay methodology.

The Standard for Monitoring Warfarin Therapy Is