How is gestational diabetes mellitus (GDM) screening accomplished?

Updated: Apr 29, 2020
  • Author: Thomas R Moore, MD; Chief Editor: George T Griffing, MD  more...
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The following 2-step screening system for gestational diabetes is currently recommended in the United States:

  • 50-g, 1-hour glucose challenge test (GCT)

  • 100-g, 3-hour oral glucose tolerance test (OGTT) - For patients with an abnormal GCT result

Alternatively, for high-risk women or in areas in which the prevalence of insulin resistance is 5% or higher (eg, the southwestern and southeastern United States), a 1-step approach can be used by proceeding directly to the 100-g, 3-hour OGTT.

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