ATI NCLEX-RN Practice Questions Practice Question
The physician has prescribed Coumadin (sodium warfarin) for a client having transient ischemic attacks. Which laboratory test measures the therapeutic level of Coumadin?
Correct Answer: A
Rationale: Prothrombin time (PT/INR) measures Coumadin's anticoagulant effect by assessing clotting time. PTT monitors heparin, and clot retraction or bleeding time are unrelated.
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