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False-positives and unnecessary biopsies with annual mammograms over 10 years

In women who have a mammogram every year for 10 years, about 613 out of 1,000 women ages 40 to 49 will have at least one false-positive test result; about 613 out of 1,000 women ages 50 to 59 will have at least one false-positive test result; and about 497 out of 1,000 women ages 60 to 69 will have at least one false-positive test result. In women who have a mammogram every year for 10 years, about 70 out of 1,000 women ages 40 to 49 will have a biopsy they do not need; about 94 out of 1,000 women ages 50 to 59 will have a biopsy they do not need; and about 98 out of 1,000 women ages 60 to 69 will have a biopsy they do not need.

Mammograms may show an abnormal result when it turns out there wasn't any cancer (called a false-positive). This means you may need more tests—such as another mammogram, a breast ultrasound, or a biopsy—to make sure you don't have cancer. These tests can be harmful and cause a lot of worry.

The information shown here is based on the best available evidence.

Current as of: May 1, 2026

Author: WebMD Ignite Staff
Clinical Review Board
All WebMD Ignite education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

Current as of: May 1, 2026

Author: WebMD Ignite Staff

Clinical Review Board
All WebMD Ignite education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

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