Abstract
This Clinical Practice Update reviews current data on screening and diagnostic criteria for pregestational and gestational diabetes mellitus during pregnancy and type 2 diabetes mellitus postpartum. This document updates Practice Bulletin No. 190, Gestational Diabetes Mellitus (Obstet Gynecol 2018;131:e49–64) and Practice Bulletin No. 201, Pregestational Diabetes Mellitus (Obstet Gynecol 2018;132:e228–48).