What this test measures
Serum copper measures total copper in plasma, ~90% of which is bound to ceruloplasmin. Interpretation always pairs with serum ceruloplasmin (the carrier protein) and, for suspected Wilson disease, 24-hour urinary copper. 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.
Why it matters
Two clinical scenarios dominate Indian practice. (1) Wilson disease — autosomal recessive ATP7B mutation causing copper accumulation in liver and brain; relatively common in India given consanguinity in some communities. Classic pattern: low serum copper, low ceruloplasmin, high 24-hour urinary copper, Kayser-Fleischer rings on slit-lamp. Untreated, presents as fulminant hepatitis or movement disorder in young adults. (2) Acquired copper deficiency — from prolonged high-dose zinc supplementation (commonest), bariatric surgery, malabsorption, parenteral nutrition without copper, or rare inherited Menkes disease. Manifests as a sideroblastic anaemia (often confused with B12 deficiency) and a myelopathy that mimics subacute combined degeneration.
How to prepare
Fast 8 hours and collect a morning trace-metal-free serum sample. Stop zinc supplements (which compete) and copper IUDs are NOT a concern. Disclose any oral contraceptives or HRT (raise ceruloplasmin and total copper). For suspected Wilson — usually ordered together with ceruloplasmin and 24-hour urine copper.
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][2] | Adults 70 – 140 (women on OCP may be higher) | < 70 — copper deficiency. Most often: chronic high-dose zinc (lozenges, multivitamins), bariatric surgery, malabsorption (coeliac, IBD), prolonged parenteral nutrition without copper, or Wilson disease (in which both serum copper and ceruloplasmin are low). Check ceruloplasmin. If features of bone-marrow failure (anaemia, neutropenia) or myelopathy — supplement copper. | > 140 — usually physiological (pregnancy, oral contraceptives, oestrogen therapy all raise ceruloplasmin, and hence total copper). Pathological raises: acute-phase response (any inflammation), liver disease (cholestasis), haematologic malignancy. Acute copper toxicity (industrial accidents, contaminated drinking water) is rare and presents with vomiting and haemolysis. |
Serum copper + ceruloplasmin patterns
| Serum Cu | Ceruloplasmin | Urine Cu (24h) | Likely cause |
|---|---|---|---|
| ↓ | ↓ | ↑ (> 100 µg/24h) | Wilson disease — confirm with KF rings + ATP7B genetics |
| ↓ | ↓ or low-normal | ↓ | Acquired copper deficiency (zinc overuse, malabsorption, bariatric) |
| Normal | Normal | Normal | No copper disorder |
| ↑ | ↑ | Normal | OCP / pregnancy / acute-phase response |
| ↑ | ↑ | Normal | Cholestatic liver disease |
Frequently asked questions
Why is my copper low if I take zinc supplements?
Zinc upregulates intestinal metallothionein, which preferentially binds copper and prevents its absorption. Daily zinc > 40 mg sustained for months commonly causes copper deficiency — the classic story is someone using high-dose zinc lozenges for cold prevention who develops anaemia and balance/leg-numbness.
How is Wilson disease diagnosed?
No single test confirms it. The classic triad is low ceruloplasmin (< 20 mg/dL), high 24-hour urinary copper (> 100 µg/24h, exaggerated by penicillamine challenge), and Kayser-Fleischer rings on slit-lamp. Genetic testing for ATP7B and a liver biopsy quantifying hepatic copper are confirmatory. Treatment is lifelong chelation (D-penicillamine or trientine) plus zinc.
Will OCP affect the result?
Yes. Oestrogen-containing oral contraceptives and HRT raise ceruloplasmin and hence total serum copper by 30–50%. Disclose this so the result can be interpreted correctly.
Is copper IUD a concern?
No. The systemic copper absorbed from a copper IUD is negligible and does not affect serum copper. Local endometrial copper levels are what produce contraception.
Why does my doctor want urine copper too?
24-hour urine copper is the most informative test for Wilson disease. In Wilson, urinary copper is markedly raised (often > 100 µg/24h, sometimes > 1000 after penicillamine challenge) because liver storage capacity is exceeded and excess copper spills into urine.
How is copper deficiency treated?
Remove the cause (stop excess zinc, supplement after bariatric surgery, etc.) and replace with oral copper gluconate or sulphate 2–8 mg/day or intravenous copper if severe. Haematology recovers in weeks; myelopathy may improve only partially even with treatment.
Related Toxicology / Trace Elements tests
Tests commonly ordered alongside 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
- NIH MedlinePlus — Copper in Diet · accessed 2026-05-30T00:00:00.000Z
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