D-xylose Absorption Test

Xylose Tolerance Test

Test Overview

The D-xylose absorption test measures the level of D-xylose, a type of sugar, in a blood or urine sample. This test is done to help diagnose problems that prevent the small intestine from absorbing nutrients in food.

D-xylose is normally easily absorbed by the intestines. When problems with absorption occur, D-xylose is not absorbed by the intestines, and its level in blood and urine is low.

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Author:	Ralph Poore	Last Updated April 30, 2007
Medical Review:	Anne C. Poinier, MD - Internal Medicine Peter J. Kahrilas, MD - Gastroenterology
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