How are type 2 diabetes and gestational diabetes mellitus (GDM) differentiated?

Updated: Apr 29, 2020
  • Author: Thomas R Moore, MD; Chief Editor: George T Griffing, MD  more...
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It can be difficult to distinguish gestational diabetes mellitus from type 2 diabetes that preceded pregnancy but was unrecognized, or whose onset occurred during pregnancy. Traditionally, the distinction has been based on whether the diabetes persisted after delivery. However, the International Association of Diabetes and Pregnancy Study Groups now recommends that high-risk women who are found to have diabetes at their initial prenatal visit, according to standard diagnostic criteria, receive a diagnosis of overt diabetes rather than gestational diabetes.

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