D-Xylose Absorption Test
(Xylose Absorption Test)

Alternate Names

  • Xylose Tolerance Test

D-xylose is a monosaccharide that is normally absorbed within the intestines, and requires no help from the liver, gallbladder, or pancreas to be transported. People with normal absorption will have high blood and urine levels after ingestion. A D-xylose Absorption Test enables your doctor to differentiate between illnesses causing diarrhea due to improper digestion (liver, gallbladder, or pancreatic diseases) from those due to poor absorption (Crohn's disease, Whipple's disease, sprue, too much bacteria in the intestines, parasitic infections such as Giardia or hookworms).

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