OXALATE

Test Code

LAB4119

Quest Code

16345

CPT Codes
83945<br><strong>This test is not available for New York patient testing.</strong>

Preferred Specimen

2 mL frozen serum collected in a red-top tube (no gel)
⁠⁠⁠⁠⁠⁠⁠OR
2 mL frozen plasma collected in a sodium heparin (green-top) tube

Patient Preparation
Ascorbic acid at very high concentration (exceeding 51 mcmol/mL plamsa) can interfere. It is recommended that patients refrain from taking excessive amounts of vitamin C or vitamin C rich food for at least 48 hours prior to collection.

Minimum Volume

0.4 mL

Instructions

Promptly centrifuge with refrigeration and separate serum or plasma into chilled plastic screw-cap vial using approved guidelines. Freeze immediately and ship with dry ice.

Transport Container

Plastic screw-cap vial

Transport Temperature

Frozen

Specimen Stability

Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Sodium fluoride/potassium oxalate (gray-top) tubes • Polymer gel separator tube

Methodology
High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS)

FDA Status
This test was developed and its performance characteristics determined by NMS Labs. It has not been cleared or approved by the US Food and Drug Administration.

This test is not available for New York patient testing.

Setup Schedule

Varies

Report Available

4-7 days

Reference Range

Reporting Limit

2.0 mcmol/L

Performing Laboratory

NMS Labs

200 Welsh Road

Horsham, PA 19044

Last Updated: June 2, 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.