Accuracy of Continuous Glucose Monitors During the Perioperative Period in Youth With Type 1 Diabetes

Inclusion Criteria: 1. Participants will be 2 to 26 years of age at the time of enrollment. 2. Participants will have a diagnosis of type 1 diabetes on insulin therapy and requiring close glucose monitoring during the hospitalization and the perioperative period. 3. Participant currently wearing a continuous glucose monitor (for example: Dexcom G6 or G7; Freestyle Libre 2, 2 Plus, or 3; Medtronic Guardian 3 or 4; or future sensors as they become available) for home diabetes management and willing to share personal CGM data with the BDC clinical CGM account. Exclusion Criteria: 1. Pregnancy. 2. Currently using hydroxyurea. 3. A condition that the investigator determines would prevent the patient from participation.