Oxalate, Serum/Plasma

Test 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 Temperature

Frozen

Specimen Stability

Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 30 days

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

Received room temperature • Gray top tube (sodium
fluoride/potassium oxalate) • Polymer gel separation tube
(SST or PST) • Received refrigerated

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.

Setup Schedule

Set up: Varies; Report available: 3-6 days

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.