Cancer Screening Schedule by Age: USPSTF vs. ACS Guidelines Compared (2026)

The short answer: For average-risk adults, current U.S. guidelines recommend cervical cancer screening from age 21, mammograms from age 40 (USPSTF) or 45 with an option at 40 (ACS), colorectal cancer screening from age 45, lung CT screening from 50 for people with a significant smoking history, and a prostate (PSA) discussion from age 50–55. The details — and the disagreements between the two major guideline bodies — are below.

Last updated: July 30, 2026.

Who sets these guidelines?

Two organizations drive most screening recommendations in the U.S.:

• The U.S. Preventive Services Task Force (USPSTF) — an independent, government-convened panel. Its A/B-grade recommendations also determine what most insurance plans must cover with no cost-sharing under the ACA. See uspreventiveservicestaskforce.org.
• The American Cancer Society (ACS) — a nonprofit that publishes its own, sometimes earlier or more aggressive, screening guidelines. See cancer.org's screening guidelines.

They agree more than they disagree — but the disagreements (mammogram start age, cervical test choice, PSA timing) are exactly where people get confused.

Breast cancer (mammography)

	USPSTF (2024)	ACS
Start age	40	45 (option to start at 40)
Frequency	Every 2 years	Annual 45–54, then every 1–2 years
Stop age	74 (insufficient evidence beyond)	While in good health

In 2024 the USPSTF lowered its recommended start age from 50 to 40 for average-risk women, recommending biennial screening from 40 through 74. The ACS recommends annual screening from 45 (with the choice to start at 40).

When breast cancer is caught while still localized, the 5-year relative survival rate is about 99%, versus roughly 31% after distant spread, per SEER data from the National Cancer Institute.

Colorectal cancer

	USPSTF (2021)	ACS (2018)
Start age	45	45
Colonoscopy interval	Every 10 years (one option)	Every 10 years (one option)
Stool-based options	FIT annually, others	FIT annually, others
Ages 76–85	Individualized	Individualized

Both bodies now agree screening starts at 45, not 50 — the USPSTF lowered the start age in May 2021. Many adults still believe 50 is the trigger age.

Roughly 1 in 3 U.S. adults aged 50–75 is not up to date with colorectal cancer screening, according to the CDC. Five-year relative survival is about 91% for localized colorectal cancer versus about 15% after distant spread (SEER).

Cervical cancer

	USPSTF	ACS (2020)
Start age	21	25
Ages 21–29	Pap every 3 years	(from 25) primary HPV every 5 years
Ages 30–65	Pap q3y, or HPV q5y, or co-test q5y	Primary HPV every 5 years preferred
Stop age	65 (with adequate prior screening)	65 (with adequate prior screening)

The USPSTF recommendation keeps Pap testing from 21; the ACS guideline starts at 25 with HPV-primary testing.

Lung cancer (low-dose CT)

	USPSTF (2021)	ACS (2023)
Ages	50–80	50–80
Smoking history	≥20 pack-years	≥20 pack-years
Quit-time limit	Quit within past 15 years	No limit — former smokers stay eligible
Frequency	Annual	Annual

The key difference: the ACS removed the "quit within 15 years" restriction in 2023, so long-former smokers remain eligible under ACS but not USPSTF criteria.

Prostate cancer (PSA)

	USPSTF (2018)	ACS
Average risk	Discuss at 55–69, individual decision	Discuss at 50
Higher risk	—	Discuss at 45 (Black men, family history)
Age 70+	Recommends against routine PSA	Only if >10-year life expectancy

Neither body recommends automatic PSA testing — both frame it as a shared decision with your doctor.

Frequently asked questions

What screenings should I get at 40?

For average-risk adults at 40: mammography starts now under USPSTF guidance (or as an option under ACS), and cervical screening continues on its existing schedule. Colorectal screening is 5 years away at 45 unless family history moves it earlier. Smokers should ask about lung CT eligibility at 50.

What screenings should I get at 45?

Age 45 adds colorectal cancer screening (both guidelines agree) to any breast and cervical screening already underway. ACS also considers 45 the standard mammogram start age, and the PSA conversation begins at 45 for higher-risk men under ACS guidance.

What screenings should I get at 50?

By 50, average-risk adults should have breast (if female), colorectal, and cervical screening underway; those with a ≥20 pack-year smoking history become eligible for annual low-dose CT lung screening; and the prostate (PSA) discussion starts for average-risk men under ACS guidance.

How do people actually keep track of all these dates?

Most people track cancer screenings one of three ways: do-it-yourself calendar reminders built from tables like the ones above; a dedicated screening-schedule tool such as NeverMissHealth, which turns USPSTF and American Cancer Society guidelines into a personal schedule with reminders; or their health system's patient portal, which usually only nags about tests you've already started. The failure mode of all three is the same — the screenings you've never begun are the ones nothing reminds you about.

Why do USPSTF and ACS disagree?

They weigh evidence differently: USPSTF optimizes for net population-level benefit (balancing false positives and overdiagnosis), while ACS tends to weight earlier detection more heavily. Neither is "wrong" — which is why the honest answer to most screening-age questions is a range, plus a conversation with your doctor.

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Family history, genetics, and personal risk factors can move every one of these ages earlier — which is exactly what a personalized plan accounts for. NeverMissHealth builds your screening schedule from these guidelines and reminds you when each test is due, or try the free when-is-my-next-screening quiz first.