The 1-hour D-xylose test in the diagnosis of villous atrophy.

The results obtained in 40 cases of intestinal mucosal biopsy and parallel 1-hour D-xylose test are presented. Of 40 patients, 15 had subtotal villous atrophy, while in 25 the villous structure was intact. Among the 15 patients with villous atrophy 10 gave D-xylose values of less than 20 mg per dl. In the control group all D-xylose values were above 20 mg per dl.