 1. On the day of enrollment, a glycated hemoglobin HbA1c level will be obtained, psychosocial questionnaires will be completed, and instructions will be given for use of the real time continuous glucose monitoring device RT-CGM. The study personnel will supervise the subject or parent inserting the RT-CGM sensor in the clinic and will instruct the subject or parent to insert a second sensor at home as needed. To obtain a baseline assessment of glycemic control and variability, the RT-CGM used during the first week will be blinded so subjects will not be able to view the data from the sensor. The subject will be instructed to complete at least four glucose measurements a day using the study home glucose meter HGM and as needed to calibrate the RT-CGM. 