Breast Screening


The Ontario Breast Screening Program (OBSP) is a province-wide, organized breast screening program that provides free, high-quality breast screening to two groups of women:

  • Women aged 50 to 74 with no signs of breast cancer are encouraged to have a mammogram every two years through the OBSP.
  • Women aged 30 to 69 who are identified as being at high risk for breast cancer can receive annual mammography and breast magnetic resonance imaging (MRI) screening through the OBSP.

Likely because of screening mammography and better cancer treatments, breast cancer mortality in the Ontario population declined by roughly 42 percent for women aged 50 to 74 and by 36 percent for women of all ages between 1990 and 2012.