Classification of Diabetes Mellitus Based on Underlying Cause

Gender of the patient

Age of the patient

Does the patient have an absolute insulin deficiency with very low C-peptide levels?

Does the patient have autoantibodies associated with Type 1 diabetes?

Is the patient ketosis prone?

Is the patient overweight with evidence of insulin resistance?

Was the onset of diabetes associated with pregnancy?

Does the patient have a genetic defect in beta-cell function associated with a specific chromosomal defect?

Does the patient have a genetic defect affecting insulin's action?

Does the patient have a disease of the exocrine pancreas?

Is the diabetes associated with a drug or chemical exposure?

Does the patient have a non-pancreatic endocrinopathy?

Has the patient had a viral infection associated with diabetes?

Does the patient have the stiff man syndrome or antibodies to the insulin receptor?

Does the patient have a hereditary disorder that may be associated with diabetes?