Difficulty: Medium
Average Score: 87%
Full-length
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.