Carcinoembryonic Antigen (CEA)

• The CEA blood test is not reliable for diagnosing cancer or as a screening test for early detection of cancer.
• CEA testing is a reliable test for recurrent colon cancer if the original cancer produced this protein before treatment.
• Most types of cancer do not produce a high CEA. Having a normal CEA level does not mean that you do not have cancer.
• CEA levels usually return to near-normal levels within 6 weeks of starting treatment if cancer treatment is successful.
• Measuring the amount of CEA in other body fluids, such as abdominal fluid (peritoneal fluid) or the fluid around the brain and spinal cord (Reference cerebrospinal fluid Opens New Window, or CSF), can determine whether cancer has spread to that part of the body.
• Other diseases, such as COPD, cirrhosis, and Reference Crohn's disease Opens New Window, may also raise CEA blood levels.
• CEA levels are usually higher in smokers than in people who do not smoke.

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