Ceruloplasmin Test

The ceruloplasmin test is a blood test used to measure the level of ceruloplasmin, a protein that carries copper in the bloodstream.

What is Ceruloplasmin?

Ceruloplasmin is a ferroxidase enzyme that plays a crucial role in the metabolism and transport of iron and copper in the body. It is produced in the liver and secreted into the bloodstream, where it binds to copper ions and facilitates their transport to various tissues.

Purpose of the Test

The ceruloplasmin test is used to:

• Diagnose and monitor Wilson's disease, a rare genetic disorder characterized by excessive accumulation of copper in the body.
• Evaluate the level of copper in the body, which can be useful in diagnosing and monitoring other conditions such as copper deficiency or overload.
• Assess liver function, as ceruloplasmin is produced in the liver and abnormalities in its level can indicate liver disease.

How the Test is Performed

A blood sample is collected from a vein in the arm, and the serum or plasma is separated and tested for ceruloplasmin levels using various laboratory techniques such as:

• Immunoturbidimetry: measures the level of ceruloplasmin by detecting the amount of antibody-antigen complex formed.
• Nephelometry: measures the level of ceruloplasmin by detecting the amount of light scattered by the antigen-antibody complex.
• Enzyme-linked immunosorbent assay (ELISA): measures the level of ceruloplasmin by detecting the amount of enzyme-linked antibody bound to the antigen.

Reference Ranges

The normal reference range for ceruloplasmin levels varies depending on the laboratory and the method used, but typical ranges are:

• Newborns: 15-50 mg/dL
• Infants: 20-60 mg/dL
• Children: 25-65 mg/dL
• Adults: 25-45 mg/dL

Interpretation of Results

Abnormal ceruloplasmin levels can indicate various conditions, including:

• Wilson's disease: low or undetectable ceruloplasmin levels.
• Copper deficiency: low ceruloplasmin levels.
• Liver disease: low or elevated ceruloplasmin levels.
• Nutritional deficiencies: low ceruloplasmin levels.

Limitations and Precautions

The ceruloplasmin test has some limitations and precautions, including:

• Pregnancy and estrogen therapy can increase ceruloplasmin levels.
• Oral contraceptives can decrease ceruloplasmin levels.
• Ceruloplasmin levels may be affected by other medical conditions, such as inflammation or infection.