President Clinton has endorsed an expert panel's recommendation that women in their 40s have a mammogram every one to two years.
The National Cancer Advisory Board's advice, released late last month, fills a vacuum created in January, when a National Institutes of Health panel declined to provide any guidance for women aged 40 to 49.
The National Cancer Institute said it accepts the NCAB recommendation and will immediately begin work on an education campaign.
The federal government's action comes less than a week after the American Cancer Society said women in their 40s should have annual mammograms. Previously, the ACS had recommended a mammogram every year or two.