Who is eligible for lung cancer screening?

Who is eligible for lung cancer screening?

The U.S. Preventive Services Task Force (USPSTF) recommends annual lung cancer screening for adults aged 50 to 80 who have a 20 pack-year smoking history and who currently smoke or have quit within the past 15 years ¹. Screening uses a low-dose CT scan. Meeting these criteria does not mean you must be screened — that is a decision to make with a clinician.

The USPSTF criteria

The USPSTF gives lung cancer screening a Grade B recommendation, finalized on March 9, 2021. In its own words: “The USPSTF recommends annual screening for lung cancer with low-dose computed tomography (LDCT) in adults aged 50 to 80 years who have a 20 pack-year smoking history and currently smoke or have quit within the past 15 years” ¹. In practice that means four things must line up: you are aged 50 to 80, you have at least a 20 pack-year smoking history, you either currently smoke or quit within the past 15 years, and the screening test is an annual LDCT.

What is a pack-year?

A pack-year is a standard way to measure how much someone has smoked over time. One pack-year means smoking one pack of cigarettes per day for one year. So a 20 pack-year history could mean one pack a day for 20 years, or two packs a day for 10 years — the totals work out the same ². The measure matters because eligibility is tied to it, and a clinician can help you estimate your own pack-year total.

What LDCT is and how screening works

Low-dose computed tomography, or LDCT, is the test used for lung cancer screening. It is a CT scan that uses a lower amount of radiation than a standard CT scan to create detailed cross-sectional images of the lungs, which lets clinicians look for small changes that might warrant a closer look ³. A screening LDCT is quick, does not require injections, and is repeated annually for people who remain eligible. Like any test, it has benefits and potential downsides — including false alarms and follow-up procedures — which is why eligibility and timing are discussed with a clinician.

How ACS 2023 differs, presented separately

It is important not to blend different guidelines into one set of “the criteria.” The American Cancer Society (ACS) updated its lung cancer screening guidance in 2023, and it differs from the USPSTF. The ACS also recommends annual LDCT for adults aged 50 to 80 with a 20 pack-year history, but it dropped the “quit within the past 15 years” cutoff that the USPSTF still includes ⁴⁵. As a result, a former smoker who quit more than 15 years ago could meet the ACS criteria while falling outside the USPSTF criteria. When a guideline matters for a decision, it is worth being clear about which one is being applied.

Shared decision-making with a clinician

Eligibility is a starting point, not an instruction. Before screening, the recommended approach is shared decision-making: a conversation in which a clinician reviews your age, smoking history, and overall health, explains the benefits and the risks of LDCT screening, and helps you weigh whether it is right for you ⁶. You may be eligible and still decide, with your clinician, that screening is not the right step — or you may have questions that change the picture. The decision is personal and clinical, not automatic.

Screening as one pathway within lung health

Lung cancer screening is one clinical pathway within the broader picture of lung health. Most of caring for your lungs is about everyday awareness and habits, and screening is a focused tool for a specific higher-risk group. If you are curious about where your lungs stand more generally, that is a separate, non-diagnostic question you can explore on its own — and if screening might apply to you, the next step is simply a conversation with a clinician.