Review Question - QID 212430

A 27-year-old woman with no past medical history presents to her primary care provider because she has begun to experience color changes in her fingers on both hands in cold temperatures. She reports having had this problem for a few years, but with the weather getting colder this winter she has grown more concerned. She says that when exposed to cold her fingers turn white, blue, and eventually red. When the problem subsides she experiences pain in the affected fingers. She says that wearing gloves helps somewhat, but she continues to experience the problem. Inspection of the digits is negative for ulcerations. Which of the following is the next best step in treatment?