Participants who complete the CLVer RCT will be eligible to enroll in the CLVer Extension Study. Informed consent and assent, when applicable, will be obtained. Participants will be contacted every 3 months at which time continuous glucose monitoring (CGM) data will be obtained if a CGM device is being used and medical history (including recent point-of-care or local laboratory HbA1c values) will be reviewed; a usual care visit performed by study staff may be considered a study contact. A study visit will occur yearly to update the diabetes and medical history, measure height and weight, determine Tanner staging, download CGM data if available, perform an MMTT, and obtain blood samples for central lab measurement of HbA1c and plasma for storage if consented. Other than the central lab samples, there are no study-specific procedures or data collection that would not be performed as part of standard care.
