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What is Positive D-xylose test indicates all of the following except: March 2011 and explain in detail?
Ans. A: Pancreatic insufficiency The urinary D-xylose test for carbohydrate absorption provides an assessment of proximal small-intestinal mucosal function Xylose: It is used to test for malabsorption by administration in water to the patient after fasting. If xylose is detected in blood and/or urine within the next few hours, it has been absorbed by the intestines. Reduction of xylose by catalytic hydrogenation produces the non-cariogenic sugar substitute xylitol. D-xylose absorption test for mucosal disease or bacterial over growth, is normal in pancreatic insufficiency.