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d-Xylose Absorption Test, Blood, 1 Hour [1199X]
Test Code14733
Preferred Specimen
4 mL whole blood collected in a sodium fluoride (gray-top) tube
Patient Preparation
For fasting test, patient should fast overnight before blood collection.
Minimum Volume
1 mL
Instructions
Note: This test cannot be performed at a Patient Service Center because of the preparation step required for the d-Xylose solution.
4 mL blood draw 1 hour post oral ingestion of d-Xylose.
Label sample vial with patient s name and the time of collection postdose (e.g., 1 hour, etc.).
4 mL blood draw 1 hour post oral ingestion of d-Xylose.
Label sample vial with patient s name and the time of collection postdose (e.g., 1 hour, etc.).
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 30 days
Refrigerated: 7 days
Frozen: 30 days
Methodology
Colorimetry (C)
FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Setup Schedule
Set up: Mon, Thurs; Report available: 1-3 days
Clinical Significance
The Xylose Absorption Test is useful in screening for carbohydrate malabsorption.
