Purpose
Overexposure/Poisoning Determination
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

8 days

Test Includes
1 Oxalate Oxalic Acid Enzymatic Assay (EZA) mcmol/L 250 Biological Marker, Poison ascorbic acid

Specimen Type
Urine
Requested Volume
3 mL
Minimum Volume
1.2 mL
Special Handling
Collect 24-hour urine specimen in a glass or plastic bottle containing 10 mL concentrated hydrochloric acid. Record the volume in liters.
Ascorbic acid at very high concentration (exceeding 16 mcmol/mL urine) 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
Refrigerated
Light Protection
Not Required
Rejection Criteria
None

Rejection criteria pertain to clinical specimen submissions only.

Stability
Room Temperature: 14 day(s)
Refrigerated: 14 day(s)
Frozen (-20 °C): 3 month(s)
1 Oxalate Oxalic Acid Enzymatic Assay (EZA) mcmol/L 250 Biological Marker, Poison ascorbic acid

Interface Map

LOINC® Information