Fasting blood sugar 10.3 can not determine which type of diabetes, to determine the type of diabetes not only need to measure blood sugar, but also need to be combined with relevant tests. Diabetes is mainly categorized into type 1 diabetes, type 2 diabetes, gestational diabetes and so on. Type 1 diabetes occurs in adolescents and is often associated with heredity, autoimmune factors, etc. Type 2 diabetes occurs in middle-aged and elderly people and is often associated with lifestyle, dietary habits, etc. Gestational diabetes is a condition that occurs during pregnancy. Gestational diabetes is diabetes that occurs during pregnancy. Tests can help determine the type of diabetes.Insulin release test and C-peptide release test in type 1 diabetes show low secretion; insulin release test in type 2 diabetes can show hyperinsulinemia, which decreases in the later stages of the disease.Autoantibody tests, such as islet cell antibodies and insulin antibodies, are mostly positive in type 1 diabetes, and are mostly negative in type 2 diabetes. Fasting blood sugar 10.3 mmol/L should be checked under the supervision of a doctor to clarify the type of diabetes.