The Libre- flash glucose monitoring system is an episodic real-time data on demand device. This means that patients can measure their glucose level when they choose by scanning the device, while at the same time a sensor automatically measures and continuously stores glucose readings day and night. Every scan shows the current glucose reading and the last 8 hours of glucose. There are no alarms and the system does not require calibration.

In the present study we aim to evaluate treatment satisfaction and comfort using the Libre flash glucose monitoring system compared to conventional Self Measurement of Blood Glucose (SMBG) in adolescents with type 1 diabetes that discontinued using continuous glucose monitoring.

The second aim of the study is to evaluate the rate of use and the impact of Libre use compared to Self-Measurement of Blood Glucose among adolescents who are sub-optimally controlled and stopped using Continuous Glucose Monitoring. The study is an investigator initiated study, single-center, randomized, parallel study of 12 weeks with an optional cross-over 12 weeks extension period .

Inclusion Criteria:

• The subject has documented Type 1 Diabetes , as defined by the American Diabetes Association and World Health Organization for at least 1 year prior to study enrollment
• The subject used continuous glucose monitoring until 3 months or more before the study start
• Age 12-17 years
• The subject has an HbA1c value > 7.5% at time of screening visit
• The subject is willing to follow study instructions
• Subject is available for entire study duration

Exclusion Criteria:

• Concomitant diseases that influence metabolic control or other medical condition, which in the Investigator's opinion, may compromise patient safety
• Significant co-morbidity that, in the opinion of the investigators would preclude participation in the study
• Any significant diseases or conditions including psychiatric disorders and substance abuse that in the opinion of the investigator is likely to affect the subject's ability to complete the study or compromise patient's safety
• Subject is taking or has taken oral or parenteral glucocorticoids within 1 month prior to screening, or plans to take oral or parenteral glucocorticoids within the planned study duration. Exceptions: Short term oral or parenteral glucocorticoids up to 7 days
• Subject has known allergy to medical grade adhesives
• Subject is participating in another study of a medical device or drug that could affect glucose measurements or glucose management or receipt of any investigational medical product within 1 month prior to screening
• Female subject of child-bearing potential who have a positive pregnancy test at screening, is pregnant, breast-feeding, or planning to become pregnant within the planned study duration or is not using adequate contraceptive methods
• Subject diagnosed with current eating disorder such as anorexia or bulimia
• Subject has a history of one or more episodes of Diabetes Keto-Acidosis requiring hospitalization within a month prior to screening
• Subject has unstable or rapidly progressive renal disease or is receiving dialysis
• Subject has active proliferating retinopathy
• Subject has current or recent history of alcohol or drug abuse
• Subject has visual impairment or hearing loss, which in the Investigator's opinion, may compromise patient ability to perform study procedures safely
• Any disease or condition that may influence the HbA1C testing