What is the use of drawing blood for carcinoembryonic antigen (CEA) in lung adenocarcinoma?

In medical diagnosis, blood tests for carcinoembryonic antigen (CEA) play an important role in lung adenocarcinoma. As a tumor marker, elevated levels of CEA are closely associated with the histological type of lung adenocarcinoma, particularly adenocarcinoma, exhibiting high sensitivity to its changes. Therefore, measuring CEA levels aids in the diagnosis and screening of lung adenocarcinoma. Dynamic monitoring of CEA levels can reflect changes in the status of lung cancer. When the condition improves, CEA concentration may decrease; however, if the condition worsens, CEA levels may rise. Additionally, CEA helps in diagnosing other gastrointestinal cancers, such as colorectal cancer. Blood tests for carcinoembryonic antigen in lung adenocarcinoma not only assist in the diagnosis and monitoring of lung adenocarcinoma but also provide valuable reference information for the screening of other cancers.