Carcinoembryonic Antigen(CEA) CLIA kit (Chemiluminescence Immunoassay) is an in vitro diagnostic quantitative test kit. CEA is a monomeric glycoprotein. The assay is further indicated for serial measurement of CEA to aid in the management of cancer patients. The main indication for CEA determinations is the follow-up and therapy-management of colorectal carcinoma.