UCSF Navigation Bar

UCSF Departments of Pathology & Laboratory Medicine Home Page

Lab Manual for Moffitt-Long and Mount Zion

Lab Manual for SFGH

Internal Resources

Click here for more information about laboratory operations and procedures

If you have additional questions regarding this test, please call: 415-353-1667

Search Our Test Menu

D-Xylose Absorption, serum

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 1/16/2014 11:01:47 AM
Entry Number 1015
UCSF home page UCSF home page About UCSF Search UCSF UCSF Medical Center