Non-small cell lung cancer antigen generally refers to non-small cell associated antigen, i.e. cytokeratin 19 fragment, and 5.34ng/ml is higher than normal, but not very high, and is mildly elevated. Cytokeratin 19 fragment, mainly found in lung, breast, uterus, bladder and other organs rich in epithelial tissue, benign and malignant lesions in these organs will lead to the elevation of non-small cell lung cancer antigen. The normal value of non-small cell lung cancer antigen should be less than 3.3ng/ml. Elevated NSCLA can be seen in benign diseases such as mastitis, pneumonia, tuberculosis, etc., and is usually mildly elevated, not more than 10 ng/ml. Elevated NSCLA can also be seen in malignant tumors such as NSCLC, breast cancer, cervical cancer, colorectal cancer, etc., and there is a higher probability of bronchopulmonary carcinoma if it is more than 30 ng/ml. Non-small cell lung cancer antigen 5.34ng/ml is higher than normal value, which belongs to mild elevation, and it is more likely to be caused by benign diseases and malignant tumors. It is recommended that the patient should consult the doctor in time so as to avoid delaying the condition.