Abstract
Pregnant women with ulcerative colitis shows frequently low estriol values in both serum and urine. 18 patients with ulcerative colitis, 4 patients with mb. Crohn, and 3 patients with a by-pass operation were examined. Low estriol concentrations were seen only in the patients with ulcerative colitis especially in patients, where an operation has been performed. In one patient with severe diarrhea the estriol concentration in serum was low until the intestinal function normalised and the estriol concentration went up exactly when the diarrhea stopped. However, no unequivocal connection between low estriol concentrations and diarrhea could be demonstrated.