Haematological aspects of life with an ileostomy.

The haematological aspects of life with an ileostomy have been studies in 51 patients, of whom 39 had had ulcerative colitis and 12 had Crohn's disease. The findings in these patients have been compared with those in 39 healthy volunteers who were matched for age and sex with the 39 patient who had had ulcerative colitis. There was evidence of a mild degree of iron deficiency in the patients with an ileostomy. This was partly due to a pre-existing iron deficiency resulting from their preceding illness and operation, as the abnormality was less pronounced in the patients in whom the ileostomy had been established for more than 3 years. There was some evidence of excessive iron loss and a controlled trial of ferrous fumurate showed that the iron deficiency was largely corrected by this means. Circulating levels of vitamin B12 were normal, but it is relevant that some of the Crohn's disease group were receiving parenteral supplements. The absorption of vitamin B12 wa low in the patients with Crohn's disease who had had an ileal resection of more than 17 cm. The absorption of vitamin B12 in the patients who had had ulcerative colitis was increased and possible mechanisms are discussed. All but one of the patients had normal levels of plasma folate and in all the red cell blood folate was normal, which can be taken as an indication of a good dietary intake and adequate absorption.