A ceruloplasmin test can help determine the levels of Copper containing protein called ceruloplasmin in your body. Ceruloplasmin, a glycoprotein produced in the liver, transports more than 95 percent of the copper in blood plasma. Copper plays an important role in the body by aiding important bodily processes, including producing energy, forming connective tissue, helping the central nervous system function. It is used to evaluate and manage disorders related to copper such as suspected Wilson's disease or hypocupremia (decreased copper levels in blood).