Mammogram Screening Guidelines: When to Start & How Often

Guidelines differ by organization; shared decision-making is key.

Major Recommendations (Average-Risk Women)

Organization	Start Age	Frequency	Stop Age	Notes
USPSTF (2024 Draft)	40	Biennial	74	Grade B; individualized 40–49
ACS (2015)	45 (option 40–44)	Annual 45–54; Biennial 55+	Life expectancy >10 yr	Annual option 40–44
ACOG	40	Annual or biennial	Individualized	Shared decision-making
ACR / SBI	40	Annual	No upper limit if healthy	Maximizes mortality reduction
NCCN	40	Annual	—	Risk-adapted

High-Risk Women (Start Earlier / Add MRI)

• BRCA1/2 mutation: Annual MRI + mammogram at 25–30 (or 10 yr before youngest family diagnosis).
• Chest radiation (age 10–30): MRI + mammogram 8 yr post-RT or age 25.
• Lifetime risk ≥20% (Tyrer-Cuzick, BRCAPRO): MRI + mammogram.
• Strong family history (multiple 1st-degree, early onset).

Screening Modalities

• 2D Digital Mammography: Standard.
• DBT (3D Tomosynthesis): Higher cancer detection, fewer recalls; becoming standard.
• Contrast-Enhanced Mammography (CEM): Emerging, similar sensitivity to MRI.
• Ultrasound: Supplemental for dense breasts (BI-RADS C/D).

Action

Discuss personal risk factors with your clinician by age 40 (or 30 if high risk) to choose a schedule.