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d-Xylose Tolerance Test

d-Xylose Tolerance Test is a topic covered in the Davis's Lab & Diagnostic Tests.

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Common Use:
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.

Normal Findings:
(Method: Spectrophotometry)

Dose GivenConventional UnitsSI Units (Conventional Units × 0.0666)
Infant dose 0.5 g/kg (max. 25 g)Greater than 15 mg/dL after 2 hrGreater than 1 mmol/L
Pediatric dose 0.5 g/kg (max. 25 g)Greater than 20 mg/dL after 2 hrGreater than 1.3 mmol/L
Adult dose
 25 gGreater than 25 mg/dL after 2 hrGreater 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 hrGreater than 1.3 mmol/L
ChildrenGreater than 16%–40% of dose in 5-hr urine sample
AdultsGreater 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

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Bladh, Mickey Lynn., and Anne M. Van Leeuwen. "D-Xylose Tolerance Test." Davis's Lab & Diagnostic Tests, 7th ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425029/all/d_Xylose_Tolerance_Test.
Bladh ML, Van Leeuwen AM. D-Xylose Tolerance Test. Davis's Lab & Diagnostic Tests. 7th ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425029/all/d_Xylose_Tolerance_Test. Accessed April 19, 2019.
Bladh, M. L., & Van Leeuwen, A. M. (2017). D-Xylose Tolerance Test. In Davis's Lab & Diagnostic Tests. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425029/all/d_Xylose_Tolerance_Test
Bladh ML, Van Leeuwen AM. D-Xylose Tolerance Test [Internet]. In: Davis's Lab & Diagnostic Tests. F.A. Davis Company; 2017. [cited 2019 April 19]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425029/all/d_Xylose_Tolerance_Test.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - d-Xylose Tolerance Test ID - 425029 A1 - Bladh,Mickey Lynn, AU - Van Leeuwen,Anne M, BT - Davis's Laboratory & Diagnostic Tests UR - https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425029/all/d_Xylose_Tolerance_Test PB - F.A. Davis Company ET - 7 DB - Nursing Central DP - Unbound Medicine ER -