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Test Code CUU Copper, 24 Hour, Urine

Reporting Name

Copper, 24 Hr, U

Useful For

Investigation of Wilson disease and obstructive liver disease using a 24-hour urine specimen

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Urine


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.


Specimen Minimum Volume

0.4 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 28 days
  Ambient  28 days
  Frozen  28 days

Reference Values

0-17 years: Not established

≥18 years: 9-71 mcg/24 h

Day(s) Performed

Monday, Thursday

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

82525

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CUU Copper, 24 Hr, U 5633-3

 

Result ID Test Result Name Result LOINC Value
8590 Copper, 24 Hr, U 5633-3
TM7 Collection Duration 13362-9
VL4 Urine Volume 3167-4

Interpretation

Humans normally excrete less than 60 mcg/day of copper in the urine.

 

Urinary copper excretion greater than 60 mcg/day may be seen in:

-Wilson disease

-Obstructive biliary disease (eg, primary biliary cirrhosis, primary sclerosing cholangitis)

-Nephrotic syndrome (due to leakage through the kidney)

-Chelation therapy

-Estrogen therapy

-Mega dosing of zinc-containing vitamins

 

Because ceruloplasmin is an acute phase reactant, urine copper is elevated during acute inflammation. During the recovery phase, urine copper is usually below normal, reflecting the expected physiologic response to replace the copper that was depleted during inflammation.

Clinical Reference

1. Zorbas YG, Kakuris KK, Deogenov VA, et al. Copper homeostasis during hypokinesia in healthy subjects with higher and lower copper consumption. Tr Elem Electro. 2008;25:169-178

2. Lech T, Sadlik JK. Contribution to the data on copper concentration in blood and urine in patients with Wilson's disease and in normal subjects. Biol Trace Elem Res. 2007;118(1):16-20

3. Rifai N, Horwath AR, Wittwer CT, eds. Tietz Textbook of Clinical Chemistry and Molecular Diagnostics. 6th ed. Elsevier; 2018

Report Available

2 to 5 days

Method Name

Triple-Quadrupole Inductively-Coupled Plasma-Mass Spectrometry (ICP-MS/MS)

Forms

If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

-Gastroenterology and Hepatology Test Request (T728)

-Biochemical Genetics Test Request (T798)