VDR and gestational diabetes: Gestational diabetes (GDM) patients are known to be at greater risk of reduced vitamin D levels as vitamin D was deficient in 70.6% of GDM patients.10,11 This study was carried out in order to investigate association between VDR-BsmI(A>G) and VDR-FokI (C>T) gene polymorphism and risk of GDM among Saudi pregnant women located in Madina-Saudi Arabia.