The prevalence and predictors of coronary artery disease were examined in people aged 40 years and younger with insulin-dependent diabetes mellitus. Analysis was performed on those who presented between 1999 and 2003 for kidney and/or pancreas transplant at the University of Minnesota, as all patients who have diabetes mellitus are required to have perioperative cardiology evaluation. The mean age was 33.5 +/- 4.4 years for 88 subjects, all had insulin-dependent diabetes mellitus, and 33% were dialysis dependent. Severe coronary artery disease was found in 18.2% of women and in 24.2% of men. Three-vessel coronary artery disease trended less in women (9.1%) compared with men (12.1%). Multivariate predictors for severe and 3-vessel coronary artery disease included prior coronary artery disease, hypertension duration, and ST-T wave changes on electrocardiogram. Coronary artery disease is twice as high as expected in young woman. Studies on early management for atherosclerosis are warranted in this high-risk population.