Mammogram guidelines from various health groups differ on when to start and how frequently to get the breast cancer screening:
—The U.S. Preventive Services Task Force recommends mammograms every other year for average-risk women between 50 and 74. It says women in their 40s benefit less but should make their own choice after weighing the pros and cons.
—The American Cancer Society recommends annual mammograms starting at 45 and switching to every other year starting at 55. It says women 40 to 44 should make their own choice.
—The American College of Obstetricians and Gynecologists recommends annual mammograms starting at 40.