Free NCLEX-PN Practice Questions Practice Question
A patient is prescribed warfarin (Coumadin) for atrial fibrillation. Which of the following lab values should the nurse monitor to determine the effectiveness of the medication?
Correct Answer: C
Rationale: Warfarin's anticoagulant effect is monitored via PT/INR, which assesses clotting time and therapeutic range for atrial fibrillation (typically INR 2.0 - 3.0). Platelet count, hemoglobin, and aPTT are not primary indicators for warfarin.
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