Indications for performing GCT: All those conditions in which there is risk of having diabetes. On the basis of risk factors females are categorised into 3 category: Low risk All of the folowing:Member of an ethnic group with a low prevalence of GDM No known diabetes in first degree relatives Age <25 years Weight normal before pregnancy Weight of previous baby normal at birth No history of abnormal glucose metabolism No H/o poor obstetrical outcomeAverage risk One or more of the following:Member of an ethnic group with a high prevalence of GDM Diabetes in a first degree relative Age > 25 years Overweight before pregnancy Weight high at birth (previous baby)High riskMarked obesity Strong family history of type II DM Previous history of GDM impaired glucose metabolism or glucosouria Unexplained stillbirth H/o previous congenitally malformed baby