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(Aust N Z J Obstet Gynaecol. 2016;56(4):352–357)The occurrence of type 1 (T1DM) and type 2 diabetes (T2DM) during pregnancy is increasing around the world. An understanding of the differences in insulin requirements between the 2 groups may have vital clinical consequences in enabling clinicians to respond effectively to gestation-specific glycemic alterations, avoid hypoglycemia, and identify subgroups for whom additional intervention would be beneficial. This study was a retrospective review conducted to examine the patterns of insulin requirements in women with preexisting diabetes during pregnancy.