What is the definition of diabetes in pregnancy?

Varying degree of glucose intolerance diagnosed or recognized for the first time during pregnancy is gestational diabetes. It may be associated with other components of metabolic syndrome independent of other factors in the next 3 years. However, in recent days type 2 diabetes is seen in adolescent and young adults making it possible that type 2 diabetes is recognized first time during screening in pregnancy. Gestational diabetes mellitus accounts for 90% of cases of diabetes mellitus in pregnancy, while preexisting type 2 diabetes accounts for 8% of those diagnosed in pregnancy. In future this number is likely to increase. Abnormal maternal glucose regulation occurs in 3–10% of pregnancies, the rising prevalence of diabetes mellitus—21 million people (7% of the population) have some form of diagnosed diabetes, another 6 million people may have undiagnosed diabetes and hence there is an expected increase in pregnancies with diabetes.