MRCP2-0686
A 55-year-old man visited the anticoagulation clinic to have his INR monitored. He had experienced an ileo-femoral deep vein thrombosis two months ago after a long-haul flight. He was prescribed warfarin 5 mg daily with a target INR of 2.5. During his visit, he reported the sudden appearance of multiple bruises on his legs without any known cause. His INR was measured at 8.8 (<1.4). What is the appropriate management for his elevated INR?