d-Xylose Tolerance Test
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To assist in the differential diagnosis of small intestine malabsorption syndromes such as celiac, tropical sprue, and Crohn’s diseases.
Plasma collected in a gray-top (fluoride/oxalate) tube and urine (from a 5-hr collection) in a clean amber plastic container.
|Dose Given||Conventional Units||SI Units (Conventional Units × 0.0666)|
|Infant dose 0.5 g/kg (max. 25 g)||Greater than 15 mg/dL after 2 hr||Greater than 1 mmol/L|
|Pediatric dose 0.5 g/kg (max. 25 g)||Greater than 20 mg/dL after 2 hr||Greater than 1.3 mmol/L|
|25 g||Greater than 25 mg/dL after 2 hr||Greater than 1.7 mmol/L|
|5 g (given if patient is known or expected to have severe symptoms)||Greater than 20 mg/dL after 2 hr||Greater than 1.3 mmol/L|
|Children||Greater than 16%–40% of dose in 5-hr urine sample|
|Adults||Greater than 16% or greater than 4 g of dose in 5-hr urine sample|
|Older adults (65 yr and older)||Greater than 14% or greater than 3.5 g of dose in 5-hr urine sample|