Glycemic dysregulation increases the risk of developing diabetes in both the mother and the child. Since more women acquire type 2 diabetes mellitus (T2DM) during pregnancy, screening at the first prenatal visit is crucial. GDM is usually diagnosed in the late second or early third trimester because of the first trimester's accuracy. GDM incidence is growing in India, necessitating clinical treatment recommendations. Due to genetic and demographic factors, Indian women are more at risk of developing insulin resistance or diabetes during pregnancy. Analytical stability is improved by HbA1c test uniformity and decreased volatility before analysis. Thus, this study explored glycosylated hemoglobin as a pregnancy GDM diagnosis tool and its impact on fetal outcomes. We come to conclusion that first-trimester HbA1c may identify high-risk GDM patients