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Labcorp Oklahoma, Inc.
Test Directory


Zinc, 24-Hour Urine (or Random)

Order Name ZINC U
Test Number: 3603850
Revision Date 02/03/2024
Test Name Methodology LOINC Code
Zinc, 24-Hour Urine (or Random)
Inductively-Coupled Plasma/Mass Spectrometry  
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 5 mL (1.7 mL) Urine, 24-hour 24 hour Urine Container Refrigerated
Alternate 1 5 mL (1.7 mL) Urine, Random Sterile Urine container Refrigerated
Instructions Special Instructions: If 24-hour urine is submitted, then request form must state 24-hour collection volume. Do not use preservative. Preservatives used for routine analysis may contain mercuric oxide (ie, Stabilur), which interferes with all metal testing. If both urinalysis and metal testing are ordered, please submit a separate urine specimen (containing no additive) for the metal testing.
Specimen: 5mL(1.7mL) aliquot of a well-mixed Urine (24-hour or random) (Note: 1.7 mL This volume does not allow for repeat testing.)
Container: Plastic urine container, no preservative
Specimen Stability: Room temperature: 14 days, Refrigerated: 14 days, Frozen: 14 days. (Freeze/thaw cycles Stable x3)
Collection Optional protocol: Instruct the patient to void at 8 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM the next morning). Screw the lid on securely.
Reject Criteria: Hemolysis, Fecal contamination.

Please provide the following information with order:
Total Volume:  (prompt code: 4182022 )
Collection Duration:(prompt code: 4182024 )
Expected TAT 3-5 Days  
Clinical Use Evaluate zinc exposure; evaluate low serum zinc levels; evaluate compliance in oral zinc therapy of Wilson disease. Low urine zinc levels in the presence of depressed serum zinc tends to confirm zinc deficiency.  Zinc deficiency is usually accompanied by decreased urine zinc excretion. Zinc deficiency, however, may be in part due to excess urine losses, especially in cirrhosis, hemolytic anemias, sickle cell disease, alcoholism, diabetes, or chronic renal diseases. This test was developed and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration. 
Performing Labcorp Test Code 003434 
CPT Code(s) 82570, 84630
Lab Section Reference Lab