Test Details: This test measures the amount of Carcino Embryonic Antigen (CEA) in the blood and in body fluids. CEA is a tumour marker, the levels of which may be elevated in cancers of the colon and rectum, prostate, ovary, lung, thyroid, or liver. High CEA levels may also be a sign of some noncancerous conditions, such as cirrhosis, noncancerous breast disease, and emphysema.