[Methods of screening of gestational diabetes between 24 and 28 weeks' gestation]

The aim of this review is to answer the question "how to detect the gestational diabetes mellitus (GDM) between 24 and 28 weeks of gestation?". Two approaches are well established: one-step approach (75 g-OGTT) and two-steps approach (50 g followed 100g-OGTT). The analysis of the literature shows that each of these methods has a good reproducibility close to 80 %, without requiring preliminary dietetics. The HAPO study provides consistent data about the 75 g-OGTT materno-fetal morbidity related. Furthermore, the one-step approach, relationship two-steps approach, has several advantages: reduction of time of diagnosis and primary care, better tolerance, simpler memorization. We recommend for the screening and the diagnosis of GDM an 75 g-OGTT with three measures: FPG, 1-h and 2-h. The various alternative methods are discussed. The measure of the fasting blood glucose isolated between 24 and 28 weeks of gestation is not a relevant approach. None of the other alternative methods (HbA1c, fructosamine, glycosuria, random and postprandial plasma glucose) cannot be recommended. Indeed, these methods have been addressed in little numerous studies, among heterogeneous populations, using variable criteria, and variable sensitivity values. Only the HbA1c might be useful to detect a pre-pregnancy diabetes mellitus.