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Test Code 5217 D-Xylose, Urine

Specimen Containers and Fixatives

Bottle #1 (no preservative) is the preferred collection container. Bottles #3 (HCl), 4 (sodium carbonate), 5 (boric acid), and 8 (acetic acid) are NOT acceptable.

Specimen Required

NorthShore Lab Services: submit 5.0 mL (1.0 min) refrigerated aliquot of a 5 hour urine collection

Hospital setting: submit 5 hour urine collection.

Client Special Instructions

In adults the recommended dose is 25 grams xylose. In children 5 gram of xylose is given. Urine is collected for 5 hours after the dose is given. Refrigerate the urine during collection. The 5 hour urine total is required for complete processing. Record the administered dose of xylose.

Day(s) and Time(s) Performed

Monday – Friday, 5 days

Reference Values

Children: 16-33% of ingested dose

Adults: >4.0 gm/5 hours (based on 25 gram dose)

Method Name

Spectrophotometry

CPT Code Information

84620

LOINC Code Information

1646-9

Fasting

Patient should be kept fasting overnight (4 hours for infants) before and during the test period.