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Xylose Absorption Test

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Also known as: Xylose Tolerance Test
Formal name: D-Xylose Absorption Test

At a Glance

Why Get Tested?

To help evaluate your ability to absorb carbohydrates

When to Get Tested?

When you have symptoms of malabsorption, such as persistent diarrhea and fatty stools

Sample Required?

Timed blood samples drawn from a vein in your arm and timed urine collection

Test Preparation Needed?

Fast for 8 hours and avoid foods high in pentose, such as jams, fruits, and pastries, for 24 hours prior to the test. Ask your doctor if there are any changes to your medications that you should make.