Purpose
Overexposure/Poisoning Determination; Biomarker
Method(s)
Enzymatic Assay (EZA)
Suggested CPT Code(s)
83945
New York State Approval Status

Approved

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

5 days

Test Includes
1 Oxalate Oxalic Acid Enzymatic Assay (EZA) mcmol/L 2 Biological Marker, Poison ascorbic acid

Specimen Type
Serum or Plasma
Requested Volume
2 mL
Minimum Volume
0.7 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.
Specimen Container
Plastic container (preservative-free)

Additional Collection Instructions

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

Rejection criteria pertain to clinical specimen submissions only.

Stability
Room Temperature: Not Stable
Refrigerated: 1 day(s)
Frozen (-20 °C): 7 day(s)
1 Oxalate Oxalic Acid Enzymatic Assay (EZA) mcmol/L 2 Biological Marker, Poison ascorbic acid

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