A CEA marker is a blood test that shows a substance in the blood that indicates the likelyhood of Colonm Rectl or Anal Cancer beig present . If thiis substance is found in large enought quantities it indicates the likelynood that there is active cancer some place in the body. Normal CEA is in teh low single digits and it can range uo to 100 or more. However, elevated CEA is not proo of cancer nor is low CEA proof that there is no cancer it is just guide of when to suspect cancer is still or again active in a peson that has had cancer.
2.9 is borderline normal and no cause for alarm now. What you really want to know is how is it changing over time? If it goes up there is reason to look closer for other signs of active cancer. If i is going down it is an indication that treatment is working.
Several months ago a mass appeared in my adrenal gland (in a CT scan), but my CEA had been dropping so my Oncologist and I were suspiscious enought that we wanted to have it biopsied to be sure. It turnd out to be cancer so the CEA was not a great indicator in this case.
Good luck and we all hope you lower your score!!!!!