**Note: All laboratory testing requires an authorizing physician. DHA Laboratory offers a patient direct program that partners you with an authorizing physician. If you have any additional questions regarding the availability of testing, please contact our laboratory by telephone or email.**
CEA is a protein that is a type of tumor marker. Tumor markers are substances that are often made by cancer cells or by normal cells in response to cancer.
Patient Preparation: Discontinue any supplements containing Biotin for 72 hours prior to specimen collection.