The early effect of breast density legislation on mammogram reporting.

1052 Background: Federal legislation mandating mammographic breast density reporting to patients has been introduced to Congress. California enacted breast density notification legislation (SB1538) on April 1, 2013. What, if any, effect legislation has on mammogram reporting is unknown. We sought to determine the impact of legislation on mammographic density reporting. Methods: A retrospective review of consecutive patients undergoing mammography at a tertiary-care institution in California between March 1, 2013 and May 31, 2013 was conducted. Demographic variables and pre- and post- legislation mammogram results were analyzed. Results: Of 2,020 mammograms performed during the study period, 5.4% did not report breast density, leaving 1,911 cases for study. Median patient age was 58 (26-92). Dense breast tissue was reported in 72.3% of cases in the month prior to legislation, compared with 50.1% and 41.3% in the first and second months post-legislation respectively (p < 0.0001). On multivariable logistic r...