In summary, the risk for developing GDM increased significantly among women with one abnormal OGTT value. This emphasizes the importance for early antenatal care and early screening and diagnosis of GDM. Greater attention should be paid to this group of women even if they had only one abnormal OGTT value. Intensive counseling regarding their risk as well as an appropriate diet control program should be advised. Such measures could prevent adverse pregnancy out comes in both the mothers and their newborn infants