Lung cancer blood test indicators mainly include CEA (3~5ng/ml), cytokeratin 19 segment antigen 21-1 (0~2.08ng/ml), NSE (0~12.5U/ml), SCC (0~2.5ng/ml), CA125 (0~35u/ml). 1.CEA: also known as carcinoembryonic antigen, the normal value of this substance in human body ranges from 3 to 5ng/ml. 2. Cytokeratin 19 segment antigen 21-1: under normal circumstances, the normal value of this substance in the human body is less than 2.08ng/ml. 3. NSE: also known as neuron-specific enolase, the normal value is usually less than 12.5U/ml. 4. SCC: also known as squamous cell carcinoma antigen, the normal value ranges from 0 to 2.5ng/ml. 5.CA125: also known as glycan antigen, the normal value range in human body is generally between 0 and 35u/ml. The blood test indexes of lung cancer have important clinical significance in tumor screening, diagnosis, efficacy evaluation, prognosis and other aspects of judgment, and it is recommended that patients with symptoms of lung discomfort should consult doctor for examination in time.