My latest CEA test is now 3.8, the lowest it’s ever been.
But before we celebrate,,we must be aware that CEA is not useful for all colon cancer patients.
Some never have an elevated CEA.
Usually, doctors watch for changes in CEA rather than a single reading.
A good friend of mine said her CEA didnt rise,yet she had reocurrence,her surgeon says it's not good guide

CEA test - http://www.mdadvice.com/library/test/medtest118.html
Tumour markers -
http://training.seer.cancer.gov/module_diagnostic/unit03_tumor_markers.html
Tumour markers - http://www.tc-cancer.com/tumormarkers.html