Shah BR, et al. - Women who met the International Association of Diabetes and Pregnancy Study Groups (IADPSG) criteria but not the two-step criteria for gestational diabetes mellitus (GDM) were examined for the risk for adverse perinatal outcomes. In this population-level cross-sectional study performed in Ontario, Canada, researchers assessed 90,140 women who underwent a 75-g oral glucose tolerance test. As per the analysis, the risk for adverse perinatal outcomes was higher for women who met IADPSG criteria but who were not diagnosed with GDM based on the current two-step diagnostic strategy, and were therefore not treated, when compared with women who do not have GDM. The current strategy for diagnosing GDM thus may lead to not reception of dietary and pharmacological treatments among women who are at risk for adverse events that could improve their pregnancy outcomes.