Pregnancy confers a state of insulin resistance and hyperinsulinemia that may predispose some women to develop diabetes. Gestational diabetes mellitus (GDM) occurs when a woman’s pancreatic function is not sufficient to overcome the diabetogenic environment of pregnancy. GDM is defined as glucose intolerance that was not present or recognized prior to pregnancy.1 In the United States, prevalence rates for GDM are higher for African American, Hispanic, American Indian, and Asian women than for white women. The prevalence of GDM in the United States varies from 1.4% to 14%. Most commonly, GDM affects between 2% and 5% of pregnant women. The amount of GDM varies in direct proportion to the prevalence of type II diabetes.2