Ceruloplasmin
Also known as: Cp
What Does Ceruloplasmin Measure?
Ceruloplasmin is a protein produced by the liver that measures the primary copper-carrying protein in the bloodstream. It is responsible for transporting approximately 95% of the copper found in blood plasma, and a ceruloplasmin blood test determines how much of this protein is circulating in your body. The test reflects both the body's copper status and liver function, since the liver synthesizes ceruloplasmin and incorporates copper into its structure before releasing it into the bloodstream.
Why Does Ceruloplasmin Matter?
Ceruloplasmin levels are clinically significant because they help diagnose and monitor copper metabolism disorders, most notably Wilson's disease — a rare genetic condition where copper accumulates dangerously in the liver, brain, and other organs — and Menkes disease, a disorder affecting copper absorption. Beyond copper disorders, ceruloplasmin is an acute-phase reactant, meaning its levels rise during inflammation, infection, pregnancy, and certain cancers, making it a useful marker for identifying systemic disease. Low ceruloplasmin can signal serious nutritional deficiencies, liver failure, or inherited metabolic disorders, while elevated levels may point to inflammatory conditions, liver disease, or malignancy.
Normal Ranges
Males
20–40 mg/dL (200–400 mg/L)
Females
25–45 mg/dL (250–450 mg/L); higher in pregnancy
Children
Varies by age: newborns 1–30 mg/dL; by age 6 months–1 year, levels rise to adult range approximately 25–50 mg/dL
Causes of High Levels
- Acute or chronic inflammation and infection (ceruloplasmin is an acute-phase reactant)
- Pregnancy and use of estrogen-containing oral contraceptives (estrogen stimulates ceruloplasmin production)
- Liver disease such as hepatitis or cirrhosis (in early stages before synthetic function fails)
- Certain cancers including lymphoma, leukemia, and solid tumors
- Rheumatoid arthritis and other autoimmune inflammatory conditions
- Copper toxicity from excess dietary or environmental copper exposure
Causes of Low Levels
- Wilson's disease — a genetic disorder causing copper to accumulate in tissues due to impaired excretion
- Menkes disease — a rare X-linked genetic disorder that impairs intestinal copper absorption
- Copper deficiency from malnutrition, malabsorption syndromes, or excessive zinc supplementation (zinc competes with copper absorption)
How to Improve Your Ceruloplasmin
Diet
- Increase copper-rich foods if levels are low: shellfish (especially oysters), beef liver, dark chocolate, nuts (cashews, almonds), and seeds (sunflower, sesame)
- Eat leafy green vegetables such as spinach and kale, which provide copper along with supporting liver health
- Limit excessive zinc intake from fortified foods, as high zinc competes with copper absorption and can lower ceruloplasmin
- Avoid high-dose vitamin C supplements exceeding 1,500 mg/day, as excess ascorbic acid can interfere with copper metabolism
- For elevated levels due to inflammation, follow an anti-inflammatory diet rich in omega-3 fatty acids, colorful vegetables, and whole grains
Supplements
- Copper supplement: 1–3 mg/day elemental copper for confirmed deficiency (only under medical supervision, as excess copper is toxic)
- Balance zinc-to-copper ratio: if taking zinc supplements, use a zinc-to-copper ratio of approximately 8:1 to 15:1 (e.g., 15 mg zinc paired with 1–2 mg copper)
- Molybdenum (45–500 mcg/day) may be used medically to reduce copper levels in certain copper overload conditions under physician guidance
- Vitamin B complex including B6 and B12 supports overall liver function and protein synthesis, indirectly supporting ceruloplasmin production
Related Biomarkers
Frequently Asked Questions
What does it mean if my ceruloplasmin is low?
Low ceruloplasmin most commonly suggests either copper deficiency or Wilson's disease. In Wilson's disease, a genetic mutation prevents the body from properly excreting copper, causing it to build up in organs — paradoxically, ceruloplasmin levels drop because the liver cannot properly incorporate copper into the protein. Low levels can also result from liver failure, protein loss through the kidneys (nephrotic syndrome), or malnutrition. Your doctor will usually order additional tests like serum copper, 24-hour urine copper, and a liver evaluation to determine the cause.
Can ceruloplasmin be used to diagnose Wilson's disease alone?
No. While low ceruloplasmin is a hallmark of Wilson's disease, it is not sufficient for diagnosis on its own because low levels can have other causes, and some Wilson's disease patients have normal ceruloplasmin levels. Diagnosis requires a combination of tests including serum copper, 24-hour urine copper, liver biopsy for copper content, slit-lamp eye examination for Kayser-Fleischer rings, and genetic testing. Ceruloplasmin is an important clue but should be interpreted alongside these other findings.
Why is ceruloplasmin higher in women, especially during pregnancy?
Estrogen stimulates the liver to produce more ceruloplasmin, which is why women generally have slightly higher levels than men. During pregnancy, estrogen levels rise dramatically, often causing ceruloplasmin to increase by 50% or more above baseline. Women taking estrogen-containing oral contraceptives or hormone replacement therapy also tend to have elevated ceruloplasmin. This physiological increase is considered normal and does not typically require medical investigation.