Diabetes mellitus (DM) is a metabolic disease characterised by hyperglycaemia caused by insulin release defects. 1 There are different types of DM; it is divided into four classes. Type 1 DM (T1DM): absolute insulin deficiency develops because of pancreatic beta cell damage. Type 2 DM (T2DM): progressive pancreatic beta cell damage and an insulin release defect develop on the basis of insulin resistance. Another type is due to genetic defects in beta cell or insulin function, endocrinopathies, exocrine pancreatic diseases and drugs (drug-induced DM). Gestational DM (GDM): this is first diagnosed during pregnancy. 2 The majority of individuals with DM have T2DM and T1DM, T2DM being the most common. 3 According to the International Diabetes Federation (IDF) 7th Diabetes Atlas, one in 11 people have been shown to have DM.Worldwide, the number of patients with DM aged 20-79 years is around 60 million, and this number is expected to reach 68 million by 2045. 4 In addition, it is estimated that one in two people with DM are undiagnosed and this corresponds to approximately 232 million people. 4 Therefore, preventive and emergency physicians in particular should be more careful in diagnosing DM. However, we think that DM is diagnosed late in our country, Turkey, because people do not prefer