title: Ammonia tolerance in the diagnosis of esophageal varices. A comparison of endoscopic, radiologic, and biochemical techniques.
mesh_terms: D000641:Ammonia / Q000097:blood*; D004932:Esophageal and Gastric Varices / Q000175:diagnosis* / Q000000981:diagnostic imaging; D004945:Esophagoscopy; D006801:Humans; D008103:Liver Cirrhosis / Q000097:blood; D011859:Radiography
chemical_list: D000641:Ammonia