Ceruloplasmin: what it is, what it tells you and when it’s tested

Ceruloplasmin is a protein made by your liver that carries almost all the copper in your blood. Doctors mainly measure it to look for Wilson disease, a rare inherited condition in which the body cannot get rid of copper.

When it’s tested

Doctors mostly order it in a young person with high liver enzymes or liver disease with no clear cause, with tremor or movement problems, or when a family member has Wilson disease. Sometimes it is also used when they suspect copper deficiency.

It is not a routine test for people who feel well. Wilson disease is rare, and without a reason to suspect it the test would mostly find false alarms.

That is why Rosa does not test it. Instead it measures ALT and AST, gamma GT, bilirubin and albumin, which show how your liver is doing and are often the first signal that points to copper.

What it tells you, and what it does not

If it is very low, Wilson disease becomes more likely. The lower it is, the stronger the suspicion.

It is not enough on its own for a diagnosis. It can also be low in healthy carriers, in people short of copper or losing protein. And a normal value does not fully rule the disease out, because it rises with inflammation.

The diagnosis is made with a specialist, combining symptoms, copper in a 24-hour urine sample, sometimes copper in the liver, and a genetic test.

That is why it is read together with other tests:

• ALT and AST: Often the first sign that prompts a copper check
• Albumin: If it is low, the liver is making less protein
• Zinc: Too much zinc lowers copper and ceruloplasmin
• CRP: It shows whether inflammation is pushing it up

Normal ceruloplasmin levels

The lab decides what is normal. Many lab reports give 20 to 60 mg/dL. Some labs print it in g/L: then the limits are 0.2 and 0.6. The range on your own report is what counts.

Below 20 mg/dL, your doctor considers Wilson disease too, along with the other causes. Below 10, the suspicion is stronger.

It is low in newborns and reaches adult levels in the first months. It rises in pregnancy and with the pill.

What your result means

Find the row for your result, in mg/dL. Which values need a doctor? Below 20; below 10, soon.

• Below 10: Very low. It points to Wilson disease, a rare condition in which copper builds up. On its own, though, it is not enough to say so. See your doctor soon: they usually refer you to a liver specialist for the other copper tests.
• 10 to below 20: Low. It can be Wilson disease, but also a healthy carrier, too little copper, or protein lost through the kidneys or gut. Talk to your doctor: they decide whether more tests are needed.
• 20 to 60: Normal. Your liver makes it normally. It makes Wilson disease less likely, but does not rule it out completely. Nothing to do, unless there are other reasons for concern.
• Above 60: High. Usually there is inflammation, a pregnancy, or you take the pill or other oestrogens. Usually nothing to do. If there is no obvious reason, ask your doctor.

If your ceruloplasmin is high or low

• Low ceruloplasmin: It needs explaining: it can be Wilson disease, but more often something else, such as too little copper or protein loss.
• High ceruloplasmin: Usually inflammation, pregnancy or the pill. Not a problem in itself.

The most common causes

The causes depend on the direction.

• Low: Wilson disease: Rare and inherited. Copper builds up in the liver and brain. It is treatable, and the earlier it is found the better.
• Low: healthy carrier: People with one copy of the altered gene can have slightly low values, without the disease.
• Low: too little copper: After bariatric surgery, with absorption problems or with too much zinc taken as a supplement.
• Low: protein loss or liver: Kidney or gut diseases that lose protein, severe malnutrition or a liver that works very poorly.
• High: inflammation and oestrogens: Infections, inflammatory diseases, pregnancy, the pill and oestrogen therapy.

What can skew the result

A few things raise it and can hide a low value.

• Ongoing inflammation: It raises it. If Wilson disease is still suspected, your doctor repeats it later.
• The pill and pregnancy: Oestrogens raise it. Tell your doctor before the blood test.
• The method: Lab methods are not all the same, especially for low values. Your doctor knows this and looks at the other tests.

When to worry

Talk to your doctor if:

• Your ceruloplasmin is below 20 mg/dL.
• It is below 10: see your doctor soon, a liver specialist is needed.
• Your liver enzymes are high with no clear cause, especially if you are young.
• You have tremor, stiffness, trouble speaking or mood changes that cannot be explained.
• A family member has Wilson disease: you should be checked too.
• Your skin or eyes are yellow and you are confused, drowsy or bleeding: call 112 or go to the emergency department.

Frequently asked questions

What are normal ceruloplasmin levels? Many lab reports give 20 to 60 mg/dL, that is 0.2 to 0.6 g/L. The range on your own report is what counts.

Low ceruloplasmin: does it mean Wilson disease? Not necessarily. Wilson disease is rare. Ceruloplasmin is also low in healthy carriers, with too little copper or with protein loss. The lower it is, the stronger the suspicion: a specialist makes the diagnosis with other tests.

High ceruloplasmin: what does it mean? Usually inflammation, pregnancy or the pill. Not a problem in itself.

What is the difference between ceruloplasmin and blood copper? Ceruloplasmin is the protein that carries copper. Most of the copper in your blood is bound to it. Doctors often order them together, with copper in the urine.

Does Rosa test ceruloplasmin? No. Rosa measures ALT and AST, gamma GT, bilirubin and albumin, which show how your liver is doing. If your doctor wants ceruloplasmin, they order it separately.

Sources

• Niguarda Hospital, Milan, laboratory test catalogue: ceruloplasmin, reference values and meaning. Ospedale Niguarda, esami di laboratorio
• Ryan and colleagues, biomarkers for diagnosis of Wilson’s disease. Cochrane Database of Systematic Reviews, 2019. PMID 31743430
• EASL and ERN Rare Liver, clinical practice guidelines on Wilson’s disease. Journal of Hepatology, 2025. PMID 40089450