Betatrophin is a newly identified hormone that promotes pancreatic beta cell proliferation, improves glucose tolerance and regulates lipids metabolism. A recent study showed that circulating concentrations of betatrophin doubled in type 1 diabetes. The objective of this study is to investigate the association of serum betatrophin levels with the progression of diabetic retinopathy in patients with type 2 diabetes and the level of betatrophin in gestational diabetes patients and pregnant women.