Mock NCLEX RN Exam Related

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A client with a history of atrial fibrillation is receiving warfarin (Coumadin). Which laboratory value should the nurse monitor closely?

  • A. Platelet count
  • B. Prothrombin time (PT/INR)
  • C. Hemoglobin
  • D. Serum potassium
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.