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HelpTest Code ZNU Zinc, 24 Hour, Urine
Ordering Guidance
The use of blood testing is recommended for children younger than 10 years; order ZN_S / Zinc, Serum.
Necessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Patient Preparation: High concentrations of barium are known to interfere with this test. If barium-containing contrast media has been administered, the specimen should not be collected for at least 96 hours.
Supplies: Urine Tubes, 10 mL (T068)
Collection Container/Tube: Clean, plastic urine collection container with no metal cap or glued insert
Submission Container/Tube: Plastic urine tube or clean, plastic aliquot container with no metal cap or glued insert
Specimen Volume: 10 mL
Collection Instructions:
1. Collect urine for 24 hours.
2. Refrigerate specimen within 4 hours of completion of 24-hour collection.
3. See Metals Analysis Specimen Collection and Transport for complete instructions.
Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Useful For
Identifying the cause of abnormal serum zinc concentrations using 24-hour urine specimens
Special Instructions
Method Name
Triple-Quadrupole Inductively Coupled Plasma Mass Spectrometry (ICP-MS/MS)
Reporting Name
Zinc, 24 Hr, USpecimen Type
UrineSpecimen Minimum Volume
0.4 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Urine | Refrigerated (preferred) | 28 days |
| Ambient | 28 days | |
| Frozen | 28 days |
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Reference Values
0-17 years: Not established
≥18 years: 109-1,476 mcg/24 h
Day(s) Performed
Monday, Thursday
Report Available
2 to 5 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
84630
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| ZNU | Zinc, 24 Hr, U | 5765-3 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 8591 | Zinc, 24 Hr, U | 5765-3 |
| TM8 | Collection Duration (h) | 13362-9 |
| VL5 | Volume (mL) | 3167-4 |