A carcinoembryonic antigen (CEA) test is a blood test used to help diagnose and manage certain types of cancers. The CEA test is used especially for cancers of the large intestine and rectum. You doctor can also use the test results to help determine if a cancer treatment is working.
What does a high CEA level mean?
The carcinoembryonic antigen (CEA) test measures the level of CEA in the blood.CEA is a protein normally found in the tissue of a developing baby in the womb. The blood level of this protein disappears or becomes very low after birth. In adults, an abnormal level of CEA may be a sign of cancer.