Assessment of HGI (Hemoglobin Glycation Index) Variability Over Time in Patients Living With Diabetes Using Continuous Glucose Monitoring ( GAP OUEST )

Inclusion Criteria: * Major (adult subject over 18), with no upper age limit * Enrolled in a social security scheme or beneficiary of such a scheme * Agreement to participate (informed, written consent) * Established diabetes (regardless the type of diabetes), known for at least 6 months at inclusion * Regular user of a glucose monitoring system for at least 3 months. Non inclusion Criteria: * Known hemoglobinopathy * Inadequate use of the flash glucose monitoring system with a capture rate of less than 70% of interstitial glucose measurements, during the 3 months preceding the inclusion visit. * Stage 5 renal insufficiency (CKD-EPI less than 15 mL/min/1.73 m2) * Pregnant or breast-feeding * Major under guardianship, curatorship or safeguard of justice * Any situation assessed by the investigator as potentially prejudicial to the participant's health as a result of participation in the study Exclusion criteria: * Treatment with corticosteroids in the 3 months preceding the visit * Unusual acute situation (infection, very unusual physical activity, etc.) deemed significant by the investigator * Pregnancy started