[Serum gastrin in various diseases of the digestive system. Clinical experience].

Fasting and after meals serum gastrin levels were determined in healthy subjects and patients with different gastroenterological diseases (duodenal and gastric ulcer, hiatal hernia with gastroesophageal reflux, Billroth II gastric resection, atrophic gastritis, Zollinger-Ellison, Ménétrier, chronic calcifying pancreatitis, gastric carcinoma and lymphoma). The results pointed to the usefulness of evaluating both fasting levels and "gastrin curve" after meals as an expression of the rapidity of response of hormone-secreting gastric cells. Calculation of the I.G.O. (Integrated Gastrin Output) must also be carried out to provide a parameter from which the overall ability of G cells to secrete in response to feeding can be assessed.