Test ID ZNUCR Zinc/Creatinine Ratio, Random, Urine
Specimen Required
Patient Preparation: High concentrations of barium are known to interfere with most metal tests. If barium-containing contrast media has been administered, a 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: 3 mL
Collection Instructions:
1. Collect a random urine specimen.
2. See Metals Analysis Specimen Collection and Transport for complete instructions.
Useful For
Identifying the cause of abnormal serum zinc concentrations using a random urine specimen
Profile Information
Test ID | Reporting Name | Available Separately | Always Performed |
---|---|---|---|
ZNCU | Zinc/Creat Ratio, U | No | Yes |
CRETR | Creatinine, Random, U | No | Yes |
Special Instructions
Method Name
ZNCU: Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)
CRETR: Enzymatic Colorimetric Assay
Reporting Name
Zinc/Creat Ratio, Random, USpecimen Type
UrineSpecimen Minimum Volume
2 mL
Specimen Stability Information
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
Urine | Refrigerated (preferred) | 28 days | |
Frozen | 28 days | ||
Ambient | 14 days |
Reference Values
ZINC/CREATININE:
0-17 years: not established
≥18 years: 89-910 mcg/g creatinine
CREATITINE:
≥18 years old: 16-326 mg/dL
Reference values have not been established for patients who are less than 18 years of age.
Day(s) Performed
Monday, Thursday
Report Available
2 to 5 daysPerforming Laboratory

Test Classification
This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
84630
82570
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
ZNUCR | Zinc/Creat Ratio, Random, U | 13473-4 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
615260 | Zinc/Creat Ratio, U | 13473-4 |
CRETR | Creatinine, Random, U | 2161-8 |