Lung cancer screening is a test to look for signs of lung cancer in otherwise healthy people. Lung cancer screening is recommended for older adults who are longtime smokers.Doctors use a low-dose computerized tomography (CT) scan of the lungs to look for lung cancer. If lung cancer is detected at a very early stage, it may be more likely to be cured.Discuss the benefits and risks of lung cancer screening with your doctor. Together you can review your risk of lung cancer and decide whether screening is right for you.