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CEA is a broad-spectrum cancer antigen that can be found in most cancers. This test was originally developed to monitor colon and rectal cancers. However, this test as most tumor markers, with perhaps the exception of the PSA test for the prostate gland, are not organ or site specific.
Normal results are <3.0 (less than 3) ng/mL; gray zone 3.1 - 5.00.
Values obtained with different assay methods should not be used interchangeably.