Your result shows the amount of copper measured in one random urine sample relative to urine creatinine. Dividing by creatinine helps account for how dilute or concentrated the urine was, but this remains a spot measurement. It is not the same as measuring the total amount of copper excreted during a 24-hour urine collection.
For this test, the desired range is <87 mcg/g creat. A result at or above 87 indicates increased copper excretion in that sample. It does not reveal the cause and does not, by itself, diagnose Wilson disease or prove that copper is accumulating in the body.
Higher values may occur with Wilson disease, cholestatic or obstructive liver disease, acute inflammation, pregnancy, estrogen use, and copper-chelating treatment. Treatment context is especially important: chelating medications are intended to move copper into the urine, so a high result during treatment has a different meaning than a high result in someone who is not receiving treatment.
A value below 87 is within this laboratory’s one-sided reference range. The test does not have a separate low cutoff. A low spot urine value alone cannot diagnose copper deficiency or establish that the body’s copper stores are adequate.
Interpret the result with the reason the test was ordered, symptoms, liver tests, serum copper, ceruloplasmin, pregnancy status, medications and supplements, and any known diagnosis or treatment for Wilson disease. When Wilson disease is being evaluated or monitored, a 24-hour urine copper collection may be used as part of the broader assessment.
Clinical Takeaway
A high random urine copper result means that increased copper excretion was detected in that sample. It does not identify the cause or directly measure how much copper is stored in the body.
If you remember only one thing
This test measures copper leaving through the urine—not copper stored in your tissues.
COPPER, RANDOM URINE
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