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Review Question - QID 212754

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QID 212754 (Type "212754" in App Search)
A 57-year-old homosexual man presents to the emergency department with epigastric pain. He has presented multiple times for the same complaint in the past. The patient has a past medical history of alcoholism and is homeless. He states that his symptoms at this time are constant and occur at all times of the day and are near his baseline. He also endorses fatty and foul smelling diarrhea during this time frame. Which of the following is the best initial diagnostic test for this patient’s condition?