In order to determine if a patient has Type 1 Diabetes or Latent Autoimmune Diabetes of Adulthood, a test for glutamic acid decarboxylase antibodies is performed. From the C-peptide test, which gauges how much insulin the body produces, this test is preferred for determining the type of diabetes. This test is especially useful for diabetic individuals over the age of 30 whose type 2 diabetes is uncertain, for instance if they are not overweight. This test also establishes if gestational diabetes, often known as type 1 diabetes, or not. condition. You are more likely to develop this problem if your parents or other family members did or do.