At least every 2 yrs
This is unclear, because a well-done study showed little difference between yearly or every 2 year mammograms in women ages 50-69.
The age to start mammograms is also unclear. For women under 50, it takes 1, 904 mammograms to prevent one death from breast cancer. Most groups recommend starting at age 40, but ask your doctor to explain your personal risks and benefits based on your history.
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