Vitamin B12 absorption has been studied in patients with subtotal gastrectomy by means of the Co60 B12 urinary excretion test. Five patients tested before and after a conventional subtotal gastrectomy showed no significant change in absorption.

Of 22 patients who were tested at various intervals after a conventional (distal) subtotal gastrectomy, 19 had normal vitiamin B12 absorption and three had low absorption that was corrected to normal by giving gastric juice with the test dose. Three patients who had had a proximal gastrectomy showed normal vitamin B12 absorption, indicating that intrinsic factor was being produced by the remaining distal portion of the stomach.

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