The D-xylose absorption test is a non invasive test of gut function involves giving the patient D-xylose in water. After 1 hour, blood is taken to measure the serum level of D-xylose. Urine is collected over 5 hours and the level of D-xylose in the urine is measured. Low levels of D-xylose in the blood or in the urine indicate that either there is excess bacteria in the intestine which is breaking down the D-xylose, or that the intestine wall is not healthy.
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