d-Xylose Absorption Test, Blood, Fasting

Test Code

DXY (NI)

Quest Code

1198

CPT Codes
84620

Preferred Specimen

4 mL whole blood collected in a sodium fluoride (gray-top) tube

Patient Preparation
Patient should fast overnight before blood collection

Minimum Volume

1 mL

Transport Container

Sodium fluoride (gray-top) tube

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 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

Tues-sat

Report Available

2-7 days

Reference Range

Accompanies report

Performing Laboratory

Quest Diagnostics Nichols Institute-Chantilly VA

14225 Newbrook Drive

Chantilly, VA 20151-2228

Last Updated: March 19, 2025

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.