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Laboratory Medicine

Test catalogue

Xylose Absorption Test (2Hrs)

Test Name

Xylose Absorption Test (2Hrs)

Gold Tube Specimen Type / Requirements

Container Type = 1 Gold Top (SST)

Minimum Volume = 2 ml serum

Tube must fill to at least ½ or greater of its vacuum capacity

Specimen Handling

Collection Instructions: Collect sample in gold or red top tube with or without gel separator. Collect baseline serum specimen (>8h fast), separate and label 2 mL aliquot. Administer Xylose dissolved in 250 mL water followed by another 250 mL water. Collect post-dose serum at 2hr. Test may be conducted with either a 5g or 25g Xylose dose. Write your initials, date and time of collection on the collection label.

Laboratory Staff Instructions: Separate and label 2 mL aliquot. Store and send specimens frozen. Specimens must be clearly labelled to distinguish baseline and timed (2 Hour) specimen.

Rejection Criteria: Grossly hemolyzed, lipemic or microbially contaminated specimens, Unlabeled or Not Sufficient Quantity Samples.

Stability:Stable refrigerated for 7 days and Frozen for 30 days.

Transportation: Send sample to core lab as soon as possible.

Required Documentation

Turnaround Time (TAT)

10 Days

Test Utilization

Reference Value

2Hrs Post-Dose:

25g Xylose: >1.6 mmol/L

5g Xylose: >1.33 mmol/L

Test Code



Quantitative Spectrophotometry

Testing Location

Referred Out – ON, Canada (ROICL02)

Other Information

Last Updated: September 18, 2019