Anti-Factor Xa Assay (Last Updated - 2/25/2005)

-used to monitor coag functions in pts. with the Lupus Anti-Coagulant who are on chronic anti-coagulation with Warfarin (Coumadin)
-INR cannot be used in these pts. to monitor coag function because these pts. already have a prolonged PT @ baseline

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References:

Goodman & Gilman's: The Pharmacologic Basis Of Therapeutics - 10th Edition - 2001. Chapter 55.