Assay for the Pancreatic Polypeptide: an Help for Clinical Practice Guidelines in Classification of the Diabetes

Inclusion Criteria: * Patients aged 18 years or older * Patients with type 1 diabetes with anti-GAD and / or IA2 and / or Znt8 positive antibodies, or characteristic clinical history, with and without exocrine deficiency (\*) * Patients with chronic alcoholic pancreatitis or cystic fibrosis origin (type 3c diabetes), complicated with diabetes defined by HbA1c\> 6.5% or treated with oral anti-diabetic and / or insulin * Patients who have given informed and written consent to participate in research * Patients affiliated to a social security scheme (\*): The exocrine deficiency is defined by an assay of fecal elastase: * without deficit of exocrine function = fecal elastase = /\> 100 μg / g * with deficit of exocrine function = fecal elastase \<100 μg / g Exclusion Criteria: * Pregnancy * Severe renal impairment (eDFG \<45 mL / min / 1.73 m²)