What this test measures
Measures total serum copper, ~90% of which is carried by ceruloplasmin. Copper is a cofactor for cytochrome c oxidase, dopamine beta-hydroxylase, lysyl oxidase and superoxide dismutase — essential for iron metabolism, connective tissue formation, neurotransmitter synthesis and antioxidant defence. The result is meaningful only paired with serum ceruloplasmin and, in suspected Wilson disease, 24-hour urinary copper.
Why it matters
Two patterns dominate Indian practice. (1) Wilson disease — autosomal recessive ATP7B mutation, more common where consanguinity occurs; classically low serum copper, low ceruloplasmin, high 24-hour urinary copper, Kayser-Fleischer rings, presenting as fulminant hepatitis or movement disorder in young adults. (2) Acquired copper deficiency — from sustained high-dose zinc supplementation (commonest), bariatric surgery, malabsorption (coeliac / IBD), prolonged parenteral nutrition without copper. Deficiency presents as a sideroblastic anaemia (often mistaken for B12 deficiency) and a myelopathy mimicking subacute combined degeneration.
How to prepare
Fast 8 hours, collect a morning trace-metal-free serum sample. Disclose oestrogen-containing oral contraceptives or HRT (raise ceruloplasmin and hence total copper). Often ordered alongside ceruloplasmin and 24-hour urine copper for suspected Wilson disease.
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| Serum Copper (µg/dL)[1] | 70 – 140 (women on OCP / pregnancy higher) | < 70 — copper deficiency or Wilson disease. Check ceruloplasmin: if both low and 24-h urine copper is high → Wilson; if both low and urine copper is also low → acquired deficiency. Replace with oral copper gluconate or sulphate 2–8 mg/day; stop offending zinc. | > 140 — pregnancy, oestrogen therapy, acute-phase response, cholestatic liver disease, haematologic malignancy. Acute copper toxicity (industrial, contaminated water) is rare and presents with vomiting and haemolysis. |
Copper / ceruloplasmin / urine copper pattern
| Serum Cu | Ceruloplasmin | 24-h Urine Cu | Likely cause |
|---|---|---|---|
| ↓ | ↓ | ↑ (> 100 µg) | Wilson disease |
| ↓ | ↓ or low-normal | ↓ | Acquired deficiency (zinc overuse, bariatric, malabsorption) |
| Normal | Normal | Normal | No copper disorder |
| ↑ | ↑ | Normal | OCP / pregnancy / acute-phase response |
| ↑ | ↑ | Normal | Cholestatic liver disease |
Frequently asked questions
Why might serum copper appear normal in Wilson?
Total serum copper can sometimes appear normal because ceruloplasmin-bound and free copper move in opposite directions. The most informative pattern is low ceruloplasmin + high 24-hour urinary copper. A liver biopsy quantifying hepatic copper is the gold standard if non-invasive results are equivocal.
I take high-dose zinc — should I check copper?
Yes, especially if you have been on 50+ mg/day zinc for several months. Sustained high-dose zinc induces intestinal metallothionein which preferentially binds copper and blocks its absorption — leading to anaemia and myelopathy.
Does OCP affect this test?
Yes — oestrogens raise ceruloplasmin and hence total copper by 30–50%. Disclose contraceptive or HRT use so the result is interpreted correctly.
Is this the same as ceruloplasmin?
No, but they go together. Ceruloplasmin is the carrier protein that holds most circulating copper. For Wilson disease workup, both are needed plus a 24-hour urine copper.
How is copper deficiency treated?
Remove the cause (stop excess zinc, supplement after bariatric surgery), then oral copper gluconate or sulphate 2–8 mg/day, or IV copper if severe. Anaemia recovers in weeks; myelopathy may only partly recover.
Related Toxicology / Trace Elements tests
Tests commonly ordered alongside SERUM COPPER, or that help interpret an unexpected result.
Sources & references
- NIH ODS — Copper Fact Sheet · accessed 2026-05-30T00:00:00.000Z
- Mayo Clinic Labs — Copper, Serum · accessed 2026-05-30T00:00:00.000Z
- EASL Clinical Practice Guideline — Wilson Disease · accessed 2026-05-30T00:00:00.000Z
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