What this test measures
Ceruloplasmin is a copper-containing acute-phase glycoprotein made by the liver. It carries about 90% of circulating copper. Low ceruloplasmin is the most distinctive lab finding in Wilson disease — an autosomal recessive disorder of copper transport (ATP7B gene mutation) — where copper accumulates in the liver, brain, eyes (Kayser-Fleischer rings) and kidneys.
Ceruloplasmin can also fall in severe liver disease (less synthesis), nephrotic syndrome (urinary loss), and aceruloplasminaemia. It rises as an acute-phase reactant in infection, inflammation, pregnancy and oestrogen use — which can mask Wilson disease.
Why it matters
Wilson disease is more common in India than in many Western countries, partly due to a higher rate of consanguineous marriages. It can present at any age but usually between 5 and 35 years, with liver disease (hepatitis, cirrhosis, fulminant liver failure), neurological symptoms (tremor, dystonia, dysarthria, parkinsonism), psychiatric symptoms (depression, behavioural change, psychosis), or any combination.
Untreated Wilson disease is fatal; treated with copper-chelation (penicillamine, trientine) and zinc, prognosis can be excellent. Ceruloplasmin is the first-line screening test in any young Indian patient with unexplained liver disease, neurological symptoms or psychiatric symptoms — especially with a family history of consanguinity or affected siblings. It is interpreted alongside 24-hour urinary copper, slit-lamp examination for KF rings, and (if suspicion high) liver biopsy + ATP7B genetic testing.
How to prepare
No fasting required. Mention any recent infection or inflammation (ceruloplasmin rises as an acute-phase reactant), oestrogen / OCP use (raises ceruloplasmin), and pregnancy (raises ceruloplasmin) — all can mask a true low value.
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 |
|---|---|---|---|
| Ceruloplasmin (mg/dL)[1][2] | 20 – 60 (method-dependent; cut-off for Wilson disease is typically < 20) | Low ceruloplasmin (<20 mg/dL) — characteristic of Wilson disease (95% of cases); also seen in severe liver disease, nephrotic syndrome (urinary loss), aceruloplasminaemia (rare), severe malnutrition / kwashiorkor, neonates (physiologically low). About 5% of Wilson patients have a normal ceruloplasmin (especially if the disease has triggered inflammation / acute hepatitis) — diagnosis cannot be excluded on ceruloplasmin alone. | High ceruloplasmin — acute or chronic inflammation, infection, pregnancy, oestrogen / OCP use, rheumatoid arthritis, malignancy. Can mask a true low value in Wilson disease. |
Wilson disease workup — typical pattern
| Test | Wilson disease finding | Interpretation |
|---|---|---|
| Serum ceruloplasmin | < 20 mg/dL | Suggestive but not diagnostic alone |
| 24-hour urinary copper | > 100 µg/day (or > 40 with provocation) | Strongly supportive |
| Slit-lamp eye examination | Kayser-Fleischer rings (KF rings) | Highly suggestive in neurological presentation |
| Liver biopsy copper | > 250 µg/g dry weight | Diagnostic gold-standard |
| ATP7B genetic testing | Two pathogenic variants | Confirms diagnosis; family screening |
| LFT | Abnormal in hepatic presentation | Useful to track liver involvement |
Frequently asked questions
When should ceruloplasmin be tested?
In any young patient (5–35 years) with unexplained liver disease, neurological symptoms (tremor, dystonia, parkinsonism), psychiatric symptoms (mood / behaviour change), or a family history of Wilson disease.
Do I need to fast?
No fasting is required.
Can ceruloplasmin be normal in Wilson disease?
Yes — about 5% of patients (especially with inflammation, oestrogen use or pregnancy) have a normal ceruloplasmin. Diagnosis is not based on ceruloplasmin alone — 24-hour urinary copper, slit-lamp examination, liver biopsy and genetic testing complete the workup.
What is a Kayser-Fleischer ring?
A brown-green deposit of copper at the periphery of the cornea, visible on slit-lamp examination. It is present in >95% of patients with neurological Wilson disease and in about 50% with purely hepatic disease. Its presence in a young patient with hepatic / neurological disease is almost diagnostic.
How is Wilson disease treated?
Lifelong copper chelation (penicillamine or trientine) for symptomatic patients, zinc maintenance (blocks intestinal copper absorption) for stable and pre-symptomatic patients. Low-copper diet (avoid liver, shellfish, mushrooms, nuts, chocolate). Liver transplantation for fulminant or advanced disease. Family screening is essential.
Should siblings be screened?
Yes — Wilson disease is autosomal recessive; siblings have a 25% chance of being affected. Screen all siblings of an affected patient with ceruloplasmin, urinary copper, LFT, slit-lamp examination, and genetic testing when an ATP7B mutation is identified.
Can ceruloplasmin be used to monitor treatment?
Not really — ceruloplasmin is mostly used for diagnosis. Treatment monitoring relies on 24-hour urinary copper, LFT, clinical response, and free copper estimation. Discuss with a hepatologist.
Related Other / Biochemistry tests
Tests commonly ordered alongside CERULOPLASMIN, or that help interpret an unexpected result.
Sources & references
- AASLD Practice Guidance — Wilson Disease · accessed 2026-05-30T00:00:00.000Z
- NCBI StatPearls — Wilson Disease · accessed 2026-05-30T00:00:00.000Z
- NIH MedlinePlus — Ceruloplasmin Test · accessed 2026-05-30T00:00:00.000Z
- Indian Association for Study of the Liver — Wilson Disease Guidelines · accessed 2026-05-30T00:00:00.000Z
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