Screening Examinations
Screening tests detect disease before symptoms appear, allowing for earlier and more effective treatment. To be recommended, a screening program must demonstrate real benefits, such as reducing disease-related deaths.

Screenings may include lab tests (blood or fluid analysis), genetic testing for inherited risks, or imaging that visualizes internal structures. Specific recommendations depend on factors like age, sex, and family history.

Lung Cancer Screening
Individuals at high risk for lung cancer but without symptoms may undergo low-dose computed tomography (LDCT) of the chest. LDCT combines X-ray technology with computer processing to create detailed images using up to 90% less radiation than a standard CT scan, making it highly effective for early detection.

Earlier screening methods such as chest X-rays and sputum cytology did not significantly reduce lung cancer deaths and are no longer recommended for this purpose.

Lung Cancer Overview
Lung cancer begins in the tissues of the lungs, most often in the cells lining the air passages. The two main types are small cell and non-small cell lung cancer. Detecting the disease early—before it spreads—greatly improves treatment success. However, many cases are diagnosed after the cancer has advanced.

Lung cancer is the leading cause of cancer deaths in the U.S. and worldwide, with about 85% of cases occurring in current or former smokers. More than 94 million Americans are current or former smokers, many at high risk.

Screening and Research
The National Lung Screening Trial (NLST) found that annual low-dose CT (LDCT) scans reduced lung cancer deaths by 20% in high-risk individuals compared to chest x-rays. As a result, major health organizations—including the American Cancer Society and U.S. Preventive Services Task Force—recommend annual LDCT screening for people at increased risk.

Who Should Be Screened
You may benefit from LDCT screening if you:

• Are 50–80 years old
• Have a 20+ pack-year smoking history
• Currently smoke or quit within the past 15 years

Screening should be done in specialized facilities with LDCT expertise and as part of a comprehensive lung care program. It’s not a substitute for quitting smoking—the most effective way to prevent lung cancer.

CT scans use X-rays to create detailed cross-sectional images of the body. Multiple X-ray beams rotate around you while the table moves through the scanner in a helical (spiral) path. A computer processes the data to produce 2D images for review.

For a chest CT, you’ll lie on the table—usually on your back—with straps or pillows for comfort and stability. You may need to raise your arms, and during the brief 5–10 second scan, you’ll be asked to hold your breath while the table moves slowly through the machine.

Benefits of LDCT Lung Screening

• Detects very small lung nodules, allowing early diagnosis when cancer is most treatable.
• Fast, painless, and noninvasive, with no residual radiation in the body.
• Uses up to 90% less radiation than a conventional CT while maintaining image quality.
• Proven to reduce lung cancer deaths in high-risk patients.
• Early detection often allows minimally invasive surgery with less lung tissue removed.

Risks of LDCT Lung Screening

• False positives may require additional testing, including biopsy, causing anxiety and potential complications.
• False negatives could delay diagnosis.
• Not all detected cancers are early stage, and some may not impact health if treated.
• Screening may lead to unnecessary treatment and cost.
• Coverage by insurance or Medicare may vary.
• Small theoretical risk of radiation-induced cancer.