is_about cancer liver disorder inflammatory bowel disease cell adhesion molecule CEACAM5 protein measurement serum carcinoembryonic antigen measurement true http://labtestsonline.org.uk/understanding/analytes/cea/tab/test/ Quantification of carcinoembryonic antigen in serum. Carcinoembryonic antigen is a cancer-specific antigen associated with both tumors and the developing fetus. The main use of this antigen is as a tumor marker, especially with respect to intestinal cancers. Production of the antigen ceases shortly before birth, but may reappear in people who develop certain types of cancer. Dani Welter