The study was performed in the Department of Obstetrics and Gynecology in Krishna Medical College from June 2011 to June 2013. The objective was to screen and diagnose all the GDM cases early during the pregnancy by Single step OGT test and to treat them early so as to reduce the maternal as well as fetal complications during pregnancy. Study detected 22 % incidence of GDM by single step 75 g OGT test. This study have detected GDM cases early and did their regular follow up till delivery. All GDM patients received treatment early and they maintained BSL within normal limit till they delivered.