Enzymatic Assay (EZA)
Gas Chromatography (GC)
Gas Chromatography/Mass Spectrometry (GC/MS)
Suggested CPT Code(s)
New York State Approval Status


Known Interference(s)
Oxalate [EZA]: ascorbic acid
Turnaround Time

7 days

Test Includes
1 Oxalate Oxalic Acid Enzymatic Assay (EZA) mcmol/L 2 Biological Marker, Poison ascorbic acid
2 Ethylene Glycol Gas Chromatography (GC) mg/dL 5 Poison, Solvent
3 Formic Acid Formate Gas Chromatography/Mass Spectrometry (GC/MS) mcg/mL 0.5 Environmental/Occupation Toxin

Test Also Known As
Compliance Statement
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.
Sample Type
Serum or Plasma
Requested Volume
5 mL
Minimum Volume
2.1 mL
Special Handling
Serum: Collect sample in Red top tube

Plasma: Collect sample in Green top tube (Sodium Heparin)
Promptly centrifuge with refrigeration and separate Serum or Plasma into chilled plastic screw capped vial using approved guidelines. Freeze immediately and ship with dry ice.

Ascorbic acid at very high concentration (exceeding 51 mcmol/mL plasma) 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.
Sample Container
Plastic container (preservative-free)

Additional Collection Instructions

Transport Temperature
Light Protection
Not Required
Rejection Criteria
Received Room Temperature. Gray top tube (Sodium Fluoride / Potassium Oxalate). Polymer gel separation tube (SST or PST).

Rejection criteria pertain to clinical sample submissions only.

Room Temperature: Not Stable
Refrigerated: 14 day(s)
Frozen (-20 °C): 30 day(s)

The CPT Codes provided in this document are based on AMA Guidelines and are for informational purposes only. NMS Labs Does not assume responsibility for billing errors due to Reliance on the CPT Codes listed in this document.

*The information contained in this document represents database configurations, as they will appear on the effective date listed above.