Vitamin D deficiency is associated with several diseases, including type 2 diabetes mellitus and GDM.[10] Previous findings have indicated that 25-(OH)D deficiency is a risk factor for GDM.[11] However, studies investigating the association of betatrophin amounts with 25(OH)D levels in GDM patients are scarce. This evidence concerns the gene ANGPTL8 and type 2 diabetes mellitus.