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D-Xylose Absorption, blood

Item Value
Approval req'd? No
Available Stat? No
Test code XYL1
Test group D-Xylose
Performed by Quest
Sendout? Yes
Method Colorimetry
Patient Preparation Adults must have fasted for 8 hours prior to sample collection. Children must fast for 4 hours before sample collection.

Outpatients should be given a prescription for the proper dose of (D+)-xylose powder to be obtained at an outside pharmacy.
Collection Instructions Note the dose on the requisition and in the patient's chart. Dose: 1.0 g/kg-maximum 25 g. Draw sample 1 hour after D-xylose administration.
Container type Gray top
Amount to Collect 4 mL blood
Sample type Blood
Preferred volume 4 mL blood
Min. Volume 1 mL blood
Processing notes Mix the sample well and refrigerate it-do not freeze. Enter the xylose dose in the computer at the time of accession. Order Quest # 1199X.
Units mg/dL
Normal range
< 6 years >14.9 mg/dL
≥ 6 years >19.9 mg/dL
Synonyms xylose
Turn around times Blood test set up as needed; urine test performed Monday-Friday. Turnaround time: 1-4 days.
CPT coding 84620-90
LOINC code 30575-5
Last Updated 12/29/2015 8:23:55 AM
Entry Number 1015
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