Aim: Appropriate screening and plasma glucose control is important during pregnancy, but an international consensus has not been reached regarding the recommended method of screening and diagnosis of gestational diabetes mellitus (GDM). We investigated glucose intolerance in pregnant women diagnosed with GDM, applying stricter screening criteria.
Methods: The study involved 452 women with singleton pregnancies, who underwent a 2 h 75 g oral glucose tolerance test between January 2006 and December 2010. They had previously been screened for GDM using Japan Society of Obstetrics and Gynecology (JSOG) criteria. We retrospectively re-evaluated their status using International Association of Diabetes and Pregnancy Study Groups (IADPSG) criteria. The major differences between JSOG and IADPSG criteria are the number of applicable threshold values, and the threshold value for fasting glucose measured by the glucose tolerance test. The insulinogenic index and insulin resistance according to the homeostasis model assessment were compared among groups in the presence or absence of obesity.
Results: GDM was diagnosed in 56 (1.07%) and 133 (2.54%) women based on the JSOG and IADPSG criteria, respectively. Compared to non-GDM, non-obese women, those diagnosed with GDM according to IADPSG criteria had significantly higher insulin resistance, while those diagnosed with GDM exceeding two or more threshold values had significantly lower insulinogenic indexes.
Conclusion: Adopting stricter diagnostic criteria increased the prevalence of GDM 2.37-fold, as women previously diagnosed with milder abnormalities in glucose levels were then diagnosed as having GDM.
Keywords: diabetes mellitus; diagnosis; disease management; gestational diabetes.
© 2016 Japan Society of Obstetrics and Gynecology.