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: September 8, 2021

Author: Healthwise Staff
Medical Review:
Adam Husney MD - Family Medicine
Kathleen Romito MD - Family Medicine
Wendy Y. Chen MD, MPH - Medical Oncology, Hematology
JoLynn Montgomery PA - Family Medicine