title: Serum gastrin levels during upper gastrointestinal endoscopy.
mesh_terms: D000328:Adult; D004724:Endoscopy; D005260:Female; D005755:Gastrins / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013997:Time Factors; D015043:Zollinger-Ellison Syndrome / Q000175:diagnosis*
chemical_list: D005755:Gastrins