https://www.ncbi.nlm.nih.gov/pubmed/3568004

In a retrospective analysis of 254 patients with a moderately elevated serum ... of CEA level in 28 patients (80%), returning to normal range below 3.5 ng/ml in 20 ...

https://www.ncbi.nlm.nih.gov/pubmed/6173181

Plasma CEA levels were determined in 280 patients with histologically proven colorectal carcinoma: in 180 once or twice preoperatively and repeatedly ...

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

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

https://www.mdedge.com/gihepnews/article/155535/gastroenterology/study-test-carcinoembryonic-antigen-colon-cancer-after

Jan 4, 2018 ... CEA levels can return to normal after colon cancer surgery – but not always. ... survival (hazard ratio, 2.0; 95% confidence interval, 1.1-3.5).

https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD011134.pub2/epdf/full

An increased level of CEA can be picked up by a blood test, which is normally done ...... 3.5 µg/L. Definition of positive. Transient. Which CEA value (s) used? All.

https://www.healio.com/hematology-oncology/gastrointestinal-cancer/news/in-the-journals/%7Bc0f21fa2-5f24-4678-b7ca-1455c09622d0%7D/elevated-biomarker-level-postoperatively-increases-colon-cancer-recurrence-risk

Dec 22, 2017 ... Multivariate analyses showed elevated postoperative CEA increased risk for recurrence (HR = 2; 95% CI, 1.1-3.5), whereas normalized ...

https://www.exeterlaboratory.com/test/carcinoembryonic-antigen-cea/

Mar 12, 2019 ... Elevated CEA levels are suggestive, but not diagnostic of cancer, since elevated levels also occur in a variety of benign conditions:.

https://labtestsonline.org/tests/carcinoembryonic-antigen-cea

Sep 8, 2016 ... Carcinoembryonic antigen (CEA) is a protein normally present at very low levels in the blood or other body fluids but that may be high in certain ...

https://www.healthline.com/health/cea

Mar 30, 2017 ... The CEA test measures the amount of CEA in the blood. A high amount of CEA in your body after a cancer treatment or surgery suggests the ...

https://www.cinj.org/effect-3-5-years-scheduled-cea-and-ct-follow-detect-recurrence-colorectal-cancer

Jan 23, 2014 ... and with a postoperative blood CEA level of 10 μg/L or less fol- ..... CEA tests, 17.6% (106/601) vs 3.5% (21/601) receiving 1 or more un-.