A serum ceruloplasmin test measures levels of ceruloplasmin, a copper-carrying protein made by the liver, primarily to help diagnose Wilson’s disease, a genetic disorder causing copper buildup, or copper deficiency. It’s a blood test that checks for abnormal copper metabolism, often used with other copper tests, and can reveal liver problems, malnutrition, or genetic conditions like Menkes disease. Results help monitor treatment for copper disorders, with low levels suggesting Wilson’s or deficiency, while high levels can indicate inflammation or certain cancers