Review Question - QID 210416

A 55-year-old man presents to his primary care physician for leg pain. The patient works as a mailman but states he has had difficulty completing his deliveries for the past month. He complains of a burning and tingling pain in his legs when he walks that goes away when he sits down and takes a break. The patient has a past medical history of obesity, diabetes, stable angina, and constipation. His current medications include insulin and metformin. The patient has a 22-pack-year smoking history and he drinks 2-3 alcoholic beverages per day. A physical exam reveals a stout man with a ruddy complexion. His gait is stable and he demonstrates 5/5 strength in his upper and lower extremities. Which of the following is the most appropriate next step in management?