The normal value of carcinoembryonic antigen is <5μg/L. 10.1 is a mild elevation, which may be caused by neoplastic or inflammatory lesions. 1. Neoplastic lesions: Carcinoembryonic antigen is a kind of polyglycoprotein complex, which belongs to a kind of broad-spectrum tumor marker and can be expressed in many kinds of tumors, and it can be used as one of the markers for assisting the diagnosis of malignant tumors, monitoring the efficacy of treatment, judging the prognosis, and the recurrence of tumors, and the elevation of carcinoembryonic antigen may be due to the diseases of colon, rectum, breast, pancreatic, gastric, and lung cancers and so on. 2. Inflammatory lesions: However, elevated carcinoembryonic antigen is not necessarily caused by tumor diseases, for example, some inflammatory diseases, such as pancreatitis, colitis, proctitis, emphysema, bronchial asthma, etc. can also appear the phenomenon of mildly elevated carcinoembryonic antigen. Patients need to undergo further investigations, such as PET-CT, abdominal CT, gastroscopy, etc. for differential diagnosis.