The accuracy of the sensors (Dexcom G5 vs FreeStyle Libre Flash glucose monitoring) will be evaluated by simultaneous wearing of the 2 sensors during 2 weeks. During these 2 weeks the patients will do at least four capillary blood glucose measurements to compare with the sensor results.
Patient satisfaction will be evaluated using a questionnaire that will be completed after the Dexcom G5 sensor has been worn for 1 month.
The data recorded by the FreeStyle Libre Flash glucose monitoring system (average glucose,% above target, % within target, % under target, amount of hypoglycemia) in the month prior to the 2 weeks of double sensor wear will be compared to the same data recorded by the Dexcom G5 mobile CGM system during the first month of use.
Children (6 to 18 years) with type 1 diabetes mellitus treated with insulin injections and wearing a FreeStyle Libre Flash glucose sensor that will switch to the Dexcom G5 mobile glucose monitoring system.