The CEA blood test is not reliable for
diagnosing cancer or as a screening test for early detection of
CEA testing is a reliable test for recurrent colon cancer
if the original cancer produced this protein before treatment.
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
Measuring the amount of CEA in other body fluids, such as
abdominal fluid (peritoneal fluid) or the fluid around the brain and spinal
cord (cerebrospinal fluid, or CSF), can determine whether
cancer has spread to that part of the body.