In January 2011, the Standards of Care of ADA endorsed the IADPSG recommendations.6 In addition, the Endocrine Society recently endorsed the IADPSG recommendations.2 The WHO updated their recommendations in 2013, and recommended glucose cut-off values for GDM corresponding to those proposed by IADPSG.4 The difference from the IADPSG guidelines is that the new WHO guidelines set a range of plasma glucose levels to distinguish diabetes in pregnancy and GDM (Table 1).4 The past diagnostic criteria recommended by the WHO in 199928 for hyperglycemia in pregnancy were those used in non-pregnant individuals (Table 1). An issue that has been problematic with these criteria relates to theFPG criterion, as the diagnostic level of ≥7.0 mmol/l is universally considered to be too high. Other organizations around the world are re-addressing their criteria for screening and diagnosis of GDM since the emergence of IADPSG recommendations. On the other side, the American Association of Obstetricians and Gynecologists (ACOG),29 and the National Institute of Health (NIH)30 have not endorsed the IADPSG recommendations, and still recommend the traditional “2-step approach”, in which an initial screening between 24-28 weeks by 50 g oral glucose challenge test (GCT), and measuring the plasma glucose concentration after one hour. Afterward, a diagnostic 3-hour 100-g OGTT is recommended for those women who exceeded the glucose threshold of ≥7.2, or ≥7.8 mmol/L (130 or 140 mg/dL) in GCT.29,30 In the 2014 Standards of Care,31 the ADA readdressed the NIH recommendation along with the IADPSG guidelines as there is insufficient data to strongly demonstrate the superiority of one strategy over the other.