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The Australasian Diabetes in Pregnancy Society (ADIPS) originally formulated recommendations for the testing and diagnosis of gestational diabetes mellitus (GDM) in 1991. 1 These guidelines were primarily based on expert opinion. With some local variations, the ADIPS guidelines have been used nationally since that time. In the light of more recent evidence, ADIPS has elected to revise these guidelines in the current document. Recommendations for future research are summarised at the end of this document.

The Hyperglycemia and Adverse Pregnancy Outcome study (HAPO) published in 20082 was a large, prospective, blinded, multinational, observational study that examined pregnancy outcomes in 23,316 women whose plasma glucose (PG) levels were≤ 5.8 mmol/L fasting and≤ 11.1 mmol/L 2-hrs post 75g oral glucose load. This study reported a strong correlation between increasing maternal glucose levels at 24-32 weeks gestation and a range of adverse maternal and fetal outcomes. Subsequent consideration by the International Association of Diabetes and Pregnancy Study Groups (IADPSG), with Australasian representation, resulted in the formulation of new consensus guidelines for the testing and diagnosis of GDM. 3 These guidelines have been endorsed by several national organisations including the American Diabetes Association4.