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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: october 25, 2023

author: healthwise staff
clinical review board
all healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use. learn how we develop our content.

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