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A patient taking warfarin for atrial fibrillation has blood tests done every 4 weeks. Which of the following laboratory results is the goal of treatment for this patient?

Explanation

• Patients taking warfarin for atrial fibrillation need to maintain an INR between 2 and 3 (normal is 0.9-1.2) to reduce the risk of emboli formation 

• Platelet count, PT, and PTT are not used to titrate warfarin dosage 

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