Mock NCLEX RN Exam Practice Question
A client with a history of atrial fibrillation is receiving warfarin (Coumadin). Which laboratory value should the nurse monitor closely?
Correct Answer: B
Rationale: Warfarin affects clotting, requiring monitoring of PT/INR to ensure therapeutic anticoagulation. Platelets (A), hemoglobin (C), and potassium (D) are not directly affected.
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