Lung cancer screening tests include chest X-rays, CT scans, and sputum cytology. Research is still being done into the effectiveness of screening since there are several types of lung cancer, some of which are hard to detect. Screening may not reduce mortality in lung cancer patients. One downside to testing is that false positives can result in unnecessary further tests that may have adverse effects. Doctors do not advise to screen or not to screen. Follow the links below to find WebMD's comprehensive coverage about how lung cancer screening is done, benefits and risks, and much more.