https://www.ascopost.com/issues/august-15-2014/high-false-positive-rate-of-elevated-cea-seen-in-patients-with-resected-colorectal-cancer/

Aug 15, 2014 ... “Of these, 358 had a false-positive elevation of CEA level, 335 had a true-positive elevation indicative of recurrent [colorectal cancer], and 35 ...

https://www.medicinenet.com/carcinoembryonic_antigen/article.htm

Both benign (harmless) and malignant (cancerous) conditions can increase the CEA level.

http://pathology.jhu.edu/pancreas/bloodmarkers.php

Elevations in CEA and CA 19-9 levels may occur in patients without cancer. For example, elevated CEA levels may be observed in smokers as well as patients ...

https://onlinelibrary.wiley.com/doi/pdf/10.3322/caac.21247

Oct 25, 2014 ... The National Comprehensive Cancer Network guidelines recommend that CEA levels be routinely monitored every. 3 to 6 months after the .... with an elevated CEA level without imaging or pathological confirmation of dis-.

https://www.webmd.com/cancer/cea-tests

Aug 12, 2018 ... And some people with cancer don't have high CEA levels. ... Include vitamins, supplements, and medicines you bought without a prescription.

https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=167&contentid=carcinoembryonic_antigen

CEA is called a tumor marker because it gives information about cancer in your body. This test may ... But having a normal CEA level doesn't rule out cancer.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4954749/

Jun 20, 2016 ... Carcinoembryonic antigen (CEA) has been shown to be associated with tumor burden in patients with colorectal cancer. However, it is also ...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5739691/

Elevated serum CEA is found in 17∼47% of colorectal cancer patients [5, 6]. ... Some patients with elevated CEA at diagnosis recur without r-CEA elevation and  ...

https://www.verywellhealth.com/carcinoembryonic-antigen-cea-797561

Feb 13, 2019 ... CEA is a blood test used to monitor some cancers, especially of the ... the change in CEA over time (serial CEA levels) that is most helpful.

https://ascopubs.org/doi/abs/10.1200/jco.2012.30.4_suppl.400

Sep 22, 2016 ... Elevated CEA level in the asymptomatic patient with normal conventional imaging: How useful is PET-CT for the detection of colorectal cancer ...