Lab result explainedVitamins and mineralsLast updated November 11, 2026

Ceruloplasmin blood test: what low and high levels mean, and Wilson disease

Ceruloplasmin (Cp) · Stand-alone test; ordered with serum copper, 24-hour urine copper and liver function tests · reported in mg/dL (outside the US usually g/L; 1 g/L = 100 mg/dL)

Ceruloplasmin is the protein that carries most of the copper in your blood, and a ceruloplasmin blood test is the first-line test for Wilson disease, an inherited condition in which copper accumulates in the liver and brain. The liver loads six copper atoms onto each ceruloplasmin molecule before releasing it; about 90 to 95 percent of the copper in plasma travels this way. Normal in adults is roughly 20 to 35 mg/dL (some labs print 16 to 45), with values lower in the first months of life and somewhat higher in early childhood, pregnancy and on estrogen.

A low ceruloplasmin is the result most people are searching for, usually because it was ordered for unexplained liver test abnormalities, a tremor or movement problem, or a psychiatric change in a young person. A value under 10 mg/dL strongly suggests Wilson disease; 10 to 20 mg/dL is suspicious and needs further testing; but ceruloplasmin alone neither confirms nor excludes the diagnosis. Up to a fifth of people with Wilson disease have a low-normal value, particularly when the liver is inflamed, and low values also occur in carriers of one Wilson gene, in copper deficiency from poor absorption or excess zinc, in protein-losing conditions, in severe liver failure and in two rare genetic disorders, Menkes disease and aceruloplasminemia.

A high ceruloplasmin is far less specific and rarely important on its own. Ceruloplasmin is an acute-phase protein that rises with infection, inflammation and tissue injury, and it is driven up by estrogen, so pregnancy, oral contraceptives and hormone therapy roughly double it. Cholestatic liver disease, lymphoma and some other cancers also raise it. The useful interpretation almost always comes from reading ceruloplasmin together with serum copper, 24-hour urine copper, liver enzymes and, when Wilson disease is in question, an eye examination for Kayser-Fleischer rings and genetic testing of the ATP7B gene.

Cp at a glance

What it is: the main copper-transport protein in plasma, made by the liver; also an enzyme (ferroxidase) that helps move iron out of cells.
Normal (adults): about 20–35 mg/dL (0.2–0.35 g/L); some labs print 16–45 mg/dL. Newborns are low (under 15), children aged 1 to 10 run higher than adults, and pregnancy or estrogen roughly doubles it. Labs differ.
Low ceruloplasmin (under 20 mg/dL, especially under 10): Wilson disease is the key diagnosis to exclude; also Wilson gene carriers, copper deficiency (malabsorption, bariatric surgery, excess zinc), protein loss (nephrotic syndrome), severe liver failure, malnutrition, Menkes disease and aceruloplasminemia.
High ceruloplasmin (above 35–45 mg/dL): inflammation, infection, pregnancy, estrogen, cholestasis, lymphoma and other cancers; rarely a problem in itself.
Wilson disease work-up: ceruloplasmin plus 24-hour urine copper (over 40 µg suspicious, over 100 µg typical), serum copper and calculated free copper, liver tests, slit-lamp eye exam, and ATP7B genetic testing; liver biopsy copper above 250 µg/g dry weight when needed.
Next step: a low value is never ignored in anyone aged roughly 3 to 55 with liver, neurological or psychiatric symptoms; a high value is rechecked when inflammation has settled.

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What Cp measures

Copper absorbed from food travels to the liver, where the ATP7B transporter inserts it into newly made ceruloplasmin and also pumps excess copper into bile for excretion. Ceruloplasmin carrying copper (holoceruloplasmin) is stable in the blood for about 5 days; the copper-free form (apoceruloplasmin) is degraded within hours. In Wilson disease, ATP7B is defective, so copper is neither loaded onto ceruloplasmin nor excreted in bile: the empty protein is destroyed quickly, blood ceruloplasmin falls, and copper builds up in the liver, then spills into the blood as loosely bound free copper and deposits in the brain, cornea and kidneys.

Most laboratories measure ceruloplasmin by immunoassay (nephelometry or turbidimetry), which detects the protein whether or not it carries copper and can therefore slightly overestimate the functional level in Wilson disease; a few use an enzymatic (oxidase) assay that measures only the copper-loaded, active form and is better at separating Wilson disease from normal. Results are reported in mg/dL in the United States and g/L elsewhere (divide mg/dL by 100). No fasting is required.

Because ceruloplasmin is both an acute-phase reactant and estrogen-responsive, the same number means different things in different people. A value of 22 mg/dL is unremarkable in a healthy man but low for a woman in late pregnancy or anyone with active hepatitis, where it would be expected to be well above normal. Clinicians also calculate non-ceruloplasmin-bound (free) copper, roughly total serum copper in µg/dL minus 3 times ceruloplasmin in mg/dL; a result above about 25 µg/dL supports copper overload even when ceruloplasmin is borderline, though the calculation is unreliable when ceruloplasmin is very low.

Normal range for Cp

Reference ranges vary between labs and by age, sex and pregnancy. Use the range printed on your own report.

Group	Typical range (mg/dL (outside the US usually g/L; 1 g/L = 100 mg/dL))	Notes
Adults, typical reference range	About 20–35 mg/dL (0.20–0.35 g/L)	Printed ranges vary from 16–31 to 20–60 mg/dL depending on the assay. Use the limits on your report.
Newborns and infants under 6 months	Roughly 5–20 mg/dL	Normally low because the liver has not yet switched on production; the test cannot diagnose Wilson disease in infancy.
Children about 1 to 10 years	Often 30–50 mg/dL	Higher than adults; a child's value in the low 20s may be low for age even though it is within the adult range.
Pregnancy (third trimester) and oral estrogen	Roughly 1.5 to 2 times usual, often 40–70 mg/dL	Estrogen increases hepatic synthesis; a normal-looking value in these settings can still be relatively low.
Borderline low	10–20 mg/dL	Suspicious for Wilson disease but also seen in about 20 percent of heterozygous carriers, in copper deficiency and in protein-losing states. Scores 1 point in the Leipzig diagnostic score; needs urine copper, eye exam and often genetic testing.
Low	Below 10 mg/dL	Strongly suggests Wilson disease (2 points in the Leipzig score); the other causes are aceruloplasminemia (undetectable), Menkes disease in infants, severe copper deficiency and advanced liver failure.
High	Above the lab's upper limit, commonly 40–80 mg/dL	Acute-phase response, pregnancy, estrogen, cholestasis, rheumatoid arthritis, lymphoma and other cancers. Not a copper-overload marker in itself.
Wilson disease, supporting values	24-hour urine copper above 40 µg (above 100 µg typical in symptomatic disease); free copper above 25 µg/dL; liver copper above 250 µg/g dry weight	Ceruloplasmin under 20 mg/dL plus Kayser-Fleischer rings is diagnostic without further testing in most guidelines.

High ceruloplasmin

A high ceruloplasmin almost always means the liver has stepped up production in response to inflammation or estrogen, not that you have too much copper. It rises alongside CRP and ferritin in infection, autoimmune disease, surgery and injury, and it roughly doubles in late pregnancy and on oral contraceptives or hormone therapy. Total serum copper rises with it, because most serum copper is simply the copper riding on ceruloplasmin, which is why a raised serum copper in a pregnant woman or someone with an infection is not copper toxicity.

A few specific conditions raise it more consistently. Cholestatic liver diseases such as primary biliary cholangitis and bile duct obstruction increase ceruloplasmin because copper that cannot leave in bile is retained; lymphoma, leukemia and several solid cancers raise it through tumor-driven inflammation; and rheumatoid arthritis, lupus and other chronic inflammatory conditions keep it elevated in proportion to disease activity. Hyperthyroidism, diabetes and heavy smoking are associated with modestly higher values.

The practical significance of a high ceruloplasmin is mostly that it can hide a low one. Someone with Wilson disease whose liver is actively inflamed, or who is pregnant or on estrogen, can have a ceruloplasmin in the normal range because the acute-phase or hormonal rise cancels out the deficiency. In anyone with a plausible story for Wilson disease, a normal value in those circumstances does not settle the question, and 24-hour urine copper, free copper and genetic testing are used instead.

Common causes

Infection and acute inflammation
Ceruloplasmin rises over 2 to 5 days with bacterial or viral infection, surgery, burns or a heart attack and returns to baseline over a few weeks; it is slower to move than CRP.
Pregnancy and estrogen
Levels climb through pregnancy to about double by the third trimester and are raised by combined oral contraceptives and oral hormone therapy; they fall back within weeks of delivery or stopping.
Chronic inflammatory and autoimmune disease
Rheumatoid arthritis, lupus, inflammatory bowel disease and vasculitis keep ceruloplasmin and serum copper elevated; the degree tracks disease activity.
Cholestasis and biliary disease
Primary biliary cholangitis, primary sclerosing cholangitis and bile duct obstruction impair biliary copper excretion and raise ceruloplasmin; liver copper is high but the mechanism is not Wilson disease.
Cancer
Lymphoma, leukemia, and cancers of the lung, breast, stomach and ovary are associated with elevated ceruloplasmin; it has been studied as a non-specific tumor marker but is not used for screening.
Hyperthyroidism and diabetes
Both are associated with modestly higher ceruloplasmin, through increased hepatic synthesis and low-grade inflammation respectively.
Smoking and heavy alcohol use
Smokers and heavy drinkers have higher average ceruloplasmin and serum copper, linked to oxidative stress and inflammation.
Copper excess from supplements or contaminated water
Chronic high copper intake raises serum copper and, to a lesser extent, ceruloplasmin; true copper toxicity is rare and usually comes from supplement overuse, acidic well water through copper pipes, or industrial exposure.

Symptoms that can go with it

Usually none from the ceruloplasmin itself; symptoms belong to the underlying inflammation, pregnancy or cancer
Fever, joint pain, fatigue or weight loss when inflammation or malignancy is the driver
Itching, pale stools and jaundice with cholestatic liver disease
Nausea, vomiting, abdominal pain and diarrhea in acute copper ingestion (rare)
Liver test abnormalities, tremor or mood change despite a normal or high ceruloplasmin in a young person, which still need Wilson disease excluded

Low ceruloplasmin

A low ceruloplasmin means either that the liver is not loading copper onto the protein, that there is not enough copper to load, or that the protein is being lost or not made. The diagnosis that must be excluded first, in anyone from early childhood to late middle age, is Wilson disease, because it is treatable and because untreated it causes progressive liver failure and neurological damage. A value under 10 mg/dL in someone with abnormal liver tests, a tremor, slurred speech, clumsiness, a change in handwriting, new depression or psychosis, or unexplained hemolysis is Wilson disease until proven otherwise. Between 10 and 20 mg/dL the probability is lower but still real, and the next tests are a 24-hour urine copper, serum copper with calculated free copper, a slit-lamp examination for Kayser-Fleischer rings, and usually ATP7B gene sequencing.

Ceruloplasmin is not a perfect Wilson test in either direction. About 5 to 20 percent of people with Wilson disease, particularly those presenting with hepatitis or in pregnancy, have values above 20 mg/dL because the acute-phase or hormonal rise masks the deficit, and roughly 20 percent of carriers (one abnormal gene, no disease) have mildly low values. Copper deficiency produces the same low ceruloplasmin for a different reason: there is no copper to attach. The common causes are months of zinc supplementation above about 50 mg a day (zinc blocks copper absorption; denture creams were a notable source), bariatric surgery and other malabsorption (celiac disease, short bowel), long-term parenteral nutrition without copper, and severe malnutrition. Copper deficiency produces anemia and low neutrophils that mimic myelodysplasia and a spinal cord disorder that mimics B12 deficiency, so it is worth finding.

The remaining causes are rarer. Nephrotic syndrome and protein-losing enteropathy lose ceruloplasmin along with other proteins. Advanced cirrhosis and acute liver failure of any cause reduce synthesis. Menkes disease, an X-linked disorder of copper transport in infant boys, gives very low ceruloplasmin with kinky hair and developmental regression. Aceruloplasminemia, caused by mutations in the ceruloplasmin gene itself, gives an undetectable level with normal copper handling but iron accumulation in the brain, liver and pancreas, presenting in adults with diabetes, anemia, retinal changes and movement disorders. And in healthy newborns ceruloplasmin is simply low for the first months of life.

Common causes

Wilson disease
Autosomal recessive ATP7B mutations prevent copper loading and biliary excretion; ceruloplasmin is under 20 mg/dL in 80 to 95 percent of cases and under 10 in most with neurological disease. Presents from about age 3 to the 50s, occasionally later, with liver disease, movement disorders, psychiatric symptoms or Coombs-negative hemolysis.
Wilson disease carrier (heterozygote)
About 1 in 90 people carry one ATP7B mutation; roughly 20 percent have mildly reduced ceruloplasmin (usually 15 to 20 mg/dL) without copper accumulation or disease.
Copper deficiency from excess zinc
Zinc intake above about 50 mg a day for months induces an intestinal protein that traps copper. Sources include high-dose zinc supplements, cold lozenges used long term and, historically, zinc-containing denture adhesive. Causes anemia, low neutrophils and neuropathy; ceruloplasmin recovers over weeks to months after stopping zinc.
Malabsorption and bariatric surgery
Copper is absorbed in the stomach and upper small intestine, so gastric bypass, celiac disease, Crohn's disease and short bowel syndrome cause deficiency; after Roux-en-Y bypass 10 to 20 percent of people become copper deficient over the years without supplementation.
Parenteral or enteral nutrition without adequate copper, and severe malnutrition
Long-term intravenous feeding with copper omitted, and protein-energy malnutrition, lower both copper and ceruloplasmin.
Protein-losing states: nephrotic syndrome, protein-losing enteropathy
Ceruloplasmin is lost into the urine or gut with albumin and other proteins; the low value accompanies a low albumin and does not indicate copper disease.
Severe liver failure
End-stage cirrhosis and acute liver failure reduce synthesis of ceruloplasmin along with albumin and clotting factors; a low value in this setting is ambiguous, because Wilson disease itself is one cause of acute liver failure in the young.
Menkes disease
X-linked ATP7A mutations in infant boys trap copper in the intestine; very low ceruloplasmin and copper, sparse kinky hair, seizures and developmental regression from 2 to 3 months of age.
Aceruloplasminemia
Mutations in the ceruloplasmin gene itself; the protein is absent, so iron cannot leave cells. Adults present with diabetes, iron-deficiency-like anemia with a high ferritin, retinal degeneration and movement or cognitive problems. Copper studies are otherwise normal.
Normal infancy
Healthy newborns have ceruloplasmin under 15 to 20 mg/dL, rising to adult or above-adult levels by 6 to 12 months; the test is not interpretable for Wilson disease before about age 1 to 3.

Symptoms that can go with it

Often none when the cause is carrier status, infancy or a mild protein-losing state
Wilson disease, liver: fatigue, jaundice, swollen abdomen or legs, easy bruising, or liver test abnormalities found on routine blood work
Wilson disease, neurological: tremor, slurred speech, drooling, clumsiness, stiffness, deteriorating handwriting or school performance, usually in the teens or twenties
Wilson disease, psychiatric: new depression, anxiety, irritability, personality change or psychosis in a young person
A brown or green-gold ring at the edge of the cornea (Kayser-Fleischer ring), usually visible only with a slit lamp
Copper deficiency: fatigue and pallor from anemia, frequent infections from low neutrophils, numb or unsteady feet and difficulty walking
Aceruloplasminemia: diabetes, anemia and movement or memory problems in middle age

Read it alongside

Serum copper — usually low in Wilson disease (because ceruloplasmin is low) but free copper is high; low in copper deficiency; high in pregnancy and inflammation. Interpreted only together with ceruloplasmin.
24-hour urine copper — the key confirmatory test: above 40 µg per day is suspicious and above 100 µg typical of symptomatic Wilson disease; low or normal in copper deficiency.
Calculated free (non-ceruloplasmin-bound) copper — serum copper in µg/dL minus 3 times ceruloplasmin in mg/dL; above about 25 µg/dL supports copper overload.
ALT, AST, alkaline phosphatase and bilirubin — Wilson disease often shows a mildly raised ALT with a disproportionately low alkaline phosphatase; an alkaline phosphatase to bilirubin ratio under 4 in acute liver failure is a strong pointer.
Albumin and PT/INR — measure liver synthetic function and reveal protein-losing states that lower ceruloplasmin for other reasons.
CBC, haptoglobin and Coombs test — Wilson disease can present with Coombs-negative hemolytic anemia; copper deficiency causes anemia with low neutrophils.
Zinc, vitamin B12 and ferritin — a low ceruloplasmin with high zinc points to zinc-induced copper deficiency; B12 is checked because copper deficiency mimics it; a high ferritin with undetectable ceruloplasmin suggests aceruloplasminemia.
CRP — a raised CRP warns that an acute-phase rise may be masking a low ceruloplasmin.

What usually happens next

If ceruloplasmin is below 20 mg/dL, expect a 24-hour urine copper collection, serum copper, liver tests and a slit-lamp eye examination; a Leipzig score of 4 or more across these tests makes Wilson disease highly likely and leads to ATP7B genetic testing or, in some cases, a liver biopsy for copper content.
If ceruloplasmin is low but urine copper, liver tests and eye examination are normal, the likely explanations are carrier status, copper deficiency or a lab-range value; expect a serum copper and zinc, a review of supplements and gut surgery, and often a repeat in a few months.
If ceruloplasmin is normal but the clinical picture still fits Wilson disease (unexplained liver disease, movement disorder or psychiatric change under about 55), the work-up continues with urine copper, free copper and genetic testing, since up to a fifth of cases have normal ceruloplasmin.
If ceruloplasmin is high, the usual plan is to look for the inflammatory or hormonal cause, confirm the liver tests are normal, and recheck when well; serum copper will be high too and does not need separate action.
If Wilson disease is confirmed, first-degree relatives are screened with ceruloplasmin, urine copper, liver tests and genetic testing, because presymptomatic treatment prevents organ damage.

Diet, lifestyle and natural levers with evidence

What can move Cp once the cause is known. Nothing here replaces finding the cause.

Stop excess zinc if ceruloplasmin is low from copper deficiency

Strong evidence

Zinc intake above the 40 mg a day upper limit, sustained for months, reliably induces copper deficiency: case series of people using 50 to 300 mg a day from supplements or denture adhesive show ceruloplasmin falling below 10 mg/dL with anemia, neutropenia and myelopathy, and ceruloplasmin and blood counts recovering within 4 to 12 weeks of stopping zinc, with neurological recovery slower and often incomplete. Check the total zinc in multivitamins, cold remedies and immune-support products.

Zinc is deliberately used, under supervision, as a treatment for Wilson disease because it blocks copper absorption; do not stop a prescribed zinc regimen without talking to the prescribing clinician.

Adequate dietary copper

Moderate evidence

The adult recommendation is 900 µg of copper a day, found in shellfish, nuts and seeds, organ meats, whole grains, legumes, dark chocolate and potatoes. In controlled depletion studies, diets providing under 0.4 mg a day lowered ceruloplasmin and copper-dependent enzymes within weeks, and repletion restored them. Most people eating a varied diet are not deficient; those who are have usually had bariatric surgery, malabsorption or excess zinc and need a supplement (typically 2 to 4 mg a day of elemental copper, decided by their clinician) rather than diet alone.

Copper supplements are never appropriate in Wilson disease or unexplained copper overload; the tolerable upper intake is 10 mg a day.

Low-copper eating pattern in Wilson disease (with medication, not instead of it)

Moderate evidence

Guidelines from the American and European liver associations advise people with Wilson disease to avoid the highest-copper foods, liver and other organ meats, shellfish, nuts, mushrooms and chocolate, particularly in the first year of treatment, and to check that domestic water from copper pipes contains under 0.1 mg/L. The evidence base is observational; diet alone cannot control copper balance and does not change the ceruloplasmin level, which stays low for life. The treatments that control copper (chelators or zinc) are prescribed and monitored by a hepatologist.

Copper monitoring after bariatric surgery and in malabsorption

Moderate evidence

Copper deficiency develops in 10 to 20 percent of people within a few years of gastric bypass and is also common in untreated celiac disease and short bowel syndrome, often presenting as anemia that does not respond to iron or a numb, unsteady gait. Bariatric society guidelines recommend copper (with ceruloplasmin) checks at least yearly after bypass and whenever anemia or neuropathy appears, and a daily multivitamin containing 1 to 2 mg of copper. Treating the underlying celiac disease with a gluten-free diet restores absorption over months.

Time the test away from inflammation and estrogen

Moderate evidence

Because an infection, a flare of inflammatory disease, pregnancy or oral estrogen can raise ceruloplasmin by 50 to 100 percent, a borderline or normal result taken in those settings can mask Wilson disease, and a mildly high result taken then means little. Where possible, a repeat drawn when well, with a CRP on the same sample, gives a cleaner baseline; nothing dietary or herbal lowers or raises ceruloplasmin in a useful way.

When to see a clinician promptly

Low ceruloplasmin with jaundice, confusion, drowsiness, easy bruising, vomiting blood or a rapidly swelling abdomen: possible acute liver failure, which in Wilson disease can progress within days and may need urgent transplant assessment.
Low ceruloplasmin with a new tremor, slurred speech, drooling, difficulty swallowing, stiffness, falls or a marked change in behavior or mood, especially under the age of about 40.
Sudden anemia with dark urine and jaundice (hemolysis) in a young person, which can be the first sign of Wilson disease.
A low or borderline result that has not been followed by a 24-hour urine copper, eye examination or genetic test, to make sure the work-up is completed rather than left as an isolated number.
Numbness or burning in the feet, an unsteady gait, or anemia that does not respond to iron in anyone taking high-dose zinc or who has had bariatric surgery or celiac disease.
Known Wilson disease in a first-degree relative: ask for screening even without symptoms, since treatment before symptoms prevents damage.

Frequently asked questions

What is a normal ceruloplasmin level?

For adults most laboratories consider roughly 20 to 35 mg/dL (0.20 to 0.35 g/L) normal, though printed ranges run from about 16 to 45 mg/dL depending on the method. Children between 1 and 10 run higher, often 30 to 50 mg/dL; newborns are low; and pregnancy or estrogen-containing medicines can double the value. A result below 20 mg/dL is considered low and below 10 mg/dL markedly low. Always read your number against the range on your own report.

What does low ceruloplasmin mean?

It means the liver is releasing little copper-loaded ceruloplasmin. The diagnosis to exclude first is Wilson disease, an inherited copper-storage disorder that damages the liver and brain and is treatable, especially if caught early. Other causes are carrying one Wilson gene (about 20 percent of carriers have mildly low values), copper deficiency from excess zinc, gut surgery or malabsorption, protein loss through the kidneys or bowel, severe liver failure, normal early infancy and the rare disorders Menkes disease and aceruloplasminemia. A low value leads to a 24-hour urine copper, serum copper, liver tests and an eye examination.

Does a low ceruloplasmin mean I have Wilson's disease?

Not on its own. A value under 10 mg/dL in someone with liver, neurological or psychiatric symptoms makes Wilson disease very likely, but values between 10 and 20 are also seen in healthy carriers and in copper deficiency, and about 5 to 20 percent of people with Wilson disease have a normal ceruloplasmin, especially when the liver is inflamed. Diagnosis rests on the combination of ceruloplasmin, 24-hour urine copper (above 40 µg suspicious, above 100 µg typical), free copper, Kayser-Fleischer rings on slit-lamp examination, and ATP7B genetic testing, often summarized in the Leipzig score; a score of 4 or more confirms it.

What is the Wilson's disease blood test?

There is no single blood test. Ceruloplasmin is the usual starting point because it is low in 80 to 95 percent of cases. It is paired with serum copper, from which free copper is calculated, and with liver enzymes and a blood count. Confirmation uses a 24-hour urine copper collection, an eye examination for Kayser-Fleischer rings and, increasingly, sequencing of the ATP7B gene, which finds mutations in about 98 percent of affected people. A liver biopsy measuring copper content (above 250 µg per gram of dry tissue) is used when the other tests are inconclusive.

What does high ceruloplasmin mean?

Usually inflammation or estrogen. Ceruloplasmin is an acute-phase protein that rises with infection, autoimmune disease, surgery, injury and cancer, and it roughly doubles in pregnancy and on oral contraceptives or hormone therapy. Cholestatic liver disease, hyperthyroidism, smoking and heavy alcohol use also raise it. A high value does not mean copper poisoning and rarely needs treatment of its own; it is rechecked when the trigger has settled. Serum copper will be high at the same time for the same reason.

Can zinc supplements cause low ceruloplasmin?

Yes. Zinc above about 40 to 50 mg a day taken for months blocks copper absorption in the gut, and copper deficiency follows: ceruloplasmin and serum copper fall, often below 10 mg/dL, with anemia, a low neutrophil count and sometimes numbness and an unsteady walk from spinal cord involvement. Cases have come from supplements, long-term zinc lozenges and zinc-containing denture creams. Blood counts and ceruloplasmin recover over weeks to months after stopping the zinc and replacing copper; nerve symptoms recover more slowly and sometimes incompletely.

Is ceruloplasmin the same as serum copper?

No, but they move together in most situations because 90 to 95 percent of the copper in blood is bound to ceruloplasmin. The exception is Wilson disease, where ceruloplasmin is low, total copper is usually low or low-normal, and the copper that is not bound to ceruloplasmin (free copper) is high and toxic. That is why clinicians calculate free copper, roughly serum copper in µg/dL minus three times ceruloplasmin in mg/dL, and treat a value above about 25 µg/dL as a sign of copper overload.

At what age can ceruloplasmin be used to test for Wilson disease?

Reliably from about age 3. Newborns and young infants normally have low ceruloplasmin because the liver has not yet switched production fully on, so a low value under 6 months means nothing on its own. Wilson disease rarely causes symptoms before age 3 to 5, and most people are diagnosed between 5 and 35, though cases have been confirmed in the 70s. In children, remember that normal values are higher than in adults, so a result in the low 20s may be relatively low for age.

References

Ceruloplasmin test. MedlinePlus, US National Library of Medicine (2022)View source
Schilsky ML, Roberts EA, Bronstein JM, et al.. A multidisciplinary approach to the diagnosis and management of Wilson disease: 2022 practice guidance on Wilson disease from the American Association for the Study of Liver Diseases. Hepatology (2023)
European Association for the Study of the Liver. EASL Clinical Practice Guidelines: Wilson's disease. Journal of Hepatology (2012)
Ferenci P, Caca K, Loudianos G, et al.. Diagnosis and phenotypic classification of Wilson disease. Liver International (2003)
Mak CM, Lam CW. Diagnosis of Wilson's disease: a comprehensive review. Critical Reviews in Clinical Laboratory Sciences (2008)
Hellman NE, Gitlin JD. Ceruloplasmin metabolism and function. Annual Review of Nutrition (2002)
Copper: fact sheet for health professionals. National Institutes of Health, Office of Dietary Supplements (2022)View source
Nations SP, Boyer PJ, Love LA, et al.. Denture cream: an unusual source of excess zinc, leading to hypocupremia and neurologic disease. Neurology (2008)
Kumar N. Copper deficiency myelopathy (human swayback). Mayo Clinic Proceedings (2006)
Milne DB. Copper intake and assessment of copper status. American Journal of Clinical Nutrition (1998)
Wilson disease. Merck Manual Professional Version (2024)
Miyajima H. Aceruloplasminemia, an inherited disorder of iron metabolism. BioMetals (2003)

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This page is educational and is not medical advice or a diagnosis. Lab results have to be interpreted together with your history, symptoms and other results by a clinician who knows you. Do not start or stop a supplement to change a lab value before the cause is known.