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1. A radio-immunoassay for gastrin has been developed using partially purified porcine gastrin to raise antibodies and highly purified natural porcine gastrin I for radio-iodination with ¹²⁵I. The separation of antibody-bound from free hormone was performed by a double-antibody method.

2. In this assay highly purified natural porcine gastrin I, synthetic human gastrin I, radio-iodinated porcine gastrin I, gastrin in the plasma of a healthy volunteer, a patient with pernicious anaemia and another patient with the Zollinger—Ellison syndrome were immunologically identical.

3. The fasting plasma gastrin concentration of fourteen gastric ulcer patients was significantly higher than that of the 113 hospital controls with no history of gastro-intestinal disease, while twenty-seven duodenal ulcer patients had gastrin levels within the normal range.

4. Plasma gastrin concentration was significantly elevated in pernicious anaemia (fifty-one patients), achlorhydria (thirty-three patients), hypochlorhydria (eleven patients) and in nine patients with histologically proven Zollinger-Ellison syndrome.

5. In human volunteers a protein meal stimulated endogenous gastrin release while a carbohydrate meal did not. Atropine sulphate I.M., and hydrochloric acid orally, produced a significant fall in the level of circulating gastrin.