system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 38-year-old man comes to the physician because of an 8-month history of upper abdominal pain. During this period, he has also had nausea, heartburn, and multiple episodes of diarrhea with no blood or mucus. He has smoked one pack of cigarettes daily for the past 18 years. He does not use alcohol or illicit drugs. Current medications include an antacid. The abdomen is soft and there is tenderness to palpation in the epigastric and umbilical areas. Upper endoscopy shows several ulcers in the duodenum and the upper jejunum as well as thick gastric folds. Gastric pH is < 2. Biopsies from the ulcers show no organisms. Which of the following tests is most likely to confirm the diagnosis?
assistant
Fasting serum gastrin level