Glycoantigen CA199 is normal, which means that this indicator is within the normal range, and should be evaluated according to other relevant indicators and the patient’s specific situation. Normal glycan antigen CA199 indicates that there is no abnormal cell proliferation that would cause this indicator to be elevated, but it does not completely exclude tumors and other diseases. If the patient has a history of tumor, a comprehensive evaluation of other markers and imaging studies is more clinically valuable. For screening patients, a normal glycan antigen CA199 does not exclude the possibility of a tumor, because most tumors do not show elevated markers in the early stages. Therefore, a normal glycaemic antigen CA199 is simply an indicator that is within the normal range and requires a comprehensive evaluation.