GADA was positive in 35% of the insulin-treated compared to 14% of the non-insulin treated patients. After re-classification of diabetes types, all patients with “definite” T1D having GADA positive, low C-peptide levels and on insulin treatment were different in terms of age of diabetes, and BMI compared to the rest of the groups.***The use of islet antibodies and C-peptide is important in identifying people with T1D***Limitation: Small sample size study. Here, INS is linked to type 1 diabetes mellitus.