Inclusion Criteria:  Type 1 diabetes determined by either autoantibodies or based on clinical and historical data or both At least 5 years (1825 days) of type 1 diabetes Minimum age 16 years Treated for type 1 diabetes at a diabetes center participating in this study Subject understands study protocol and agrees to comply with it and has been able to read the patient information sheet, has had time to ask questions and get answers and gives signed informed consent.  Exclusion Criteria:  Non-type 1 diabetes Patients with a duration of type 1 diabetes below 5 years Patients under the age of 16 years Pregnancy and breastfeeding, until 3 months (12 weeks) after childbirth or breastfeeding On experimental medication or participating in other studies with conflicting goals and schedules Diseases or conditions that the investigator/physician believes to be a contraindication to participate Unwilling to be informed on incidental findings.