Problem: A 56-year-old male is taking warfarin 3 mg daily for treatment of a DVT / PE. He has his INR monitored every 4 weeks. His INR today is 3.1. The last two levels were 2.8 previously and 3.0 before that. There have been no changes in his medications, diet, or health. Knowing what normal INR goal is for a patient on warfarin, how would you manage his INR today?
a. Have patient follow up in 2 weeks for a recheck
b. Hold the dose and recheck the level in 2 days
c. Decrease the dose by half and recheck in 3 weeks
d. Stop the warfarin