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This kit is for the quantitative determination of Factor X activity in human citrated plasma. The DiaPharma Factor X Kit is an in vitro diagnostic test kit for the quantitative determination of Factor X activity in human citrated plasma. Factor X activity is useful for monitoring patients on oral anticoagulant therapy (warfarin) where baseline INR values are prolonged and INR results are not reliable, such as in OAC patients with lupus inhibitors.  The DiaPharma Factor X Kit is also useful for screening for factor X deficiencies.