Nursing Central: d-Xylose Tolerance Test

d-Xylose Tolerance Test

General

Synonym/Acronym:
N/A.

Common Use:
To assist in the differential diagnosis of small intestine malabsorption syndromes such as celiac, tropical sprue, and Crohn’s diseases.

Specimen:
Plasma (1 mL) collected in a gray-top (fluoride/oxalate) tube and urine (10 mL from a 5-hr collection) in a clean amber plastic container.

Normal Findings:
(Method: Spectrophotometry)

Dose by Age	Conventional Units	SI Units (Conventional Units × 0.0666)
Plasma
Adult dose
25 g	Greater than 25 mg/dL	Greater than 1.7 mmol/L
5 g	Greater than 20 mg/dL	Greater than 1.3 mmol/L
Pediatric dose
0.5 g/kg (max. 25 g)	Greater than 30 mg/dL	Greater than 2 mmol/L
Urine
Adult dose
25 g	Greater than 4 g/5-hr collection	Greater than 26.6 mmol/5 hr
5 g	Greater than 1.2 g/5-hr collection	Greater than 8 mmol/5 hr
Pediatric dose
0.5 g/kg (max. 25 g)	Greater than 16%–40% of dose	Greater than 16%–40% of dose

d-Xylose Tolerance Test has been found in Davis's Lab & Diagnostic Tests

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