A thrombosis risk testing profile is ordered on a patient being treated with warfarin for a blood clot in the leg. Select the best course of action
a. Run the tests immediately.
b. Reject the order.
c. Perform only the tests for protein C and protein S.
d. Recommend the testing be postponed until the warfarin is discontinued.
ANS: D
Testing should be postponed until the warfarin has been discontinued for 10 to 14 days. Warfarin blocks the normal synthesis of vitamin K–dependent proteins, which include protein C and protein S.
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