Activated Clotting Time (ACT) (Last Updated - 2/25/2005)

-used instead of the aPTT to monitor coag function during CP bypass surgery when very high levels of IV Heparin are used
-large amounts of IV Heparin will increase the aPTT to very high levels and make it difficult to monitor the pts. coag functions

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References:

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