Effects of Real-time Continuous Glucose Monitoring System on Hospital-to-home Transitional Blood Glucose Control

Inclusion Criteria: 1. 18 years old ≤ age ≤ 80 years old. 2. Type 2 diabetes admitted to Department of Endocrinology and Metabolism. 3. 8% ≤ HbA1c ≤ 12% in the last 1 month. 4. Insulin therapy within 1 month of planned discharge from hospital. 5. Frequency of self-monitoring of blood glucose \<4 times per week and no use of real-time continuous glucose monitoring system in the 3 months prior to hospitalisation. 6. Willing and able to provide written informed consent and comply with the requirements of this study. Exclusion Criteria: 1. Oral steroid hormone therapy. 2. Patients with acute complications of diabetes (including Diabetic ketoacidosis, hyperglycemia and hyperosmolality, Lactic acidosis) 3. Patients with severe liver disease (alanine aminotransferase or glutamine aminotransferase exceeding more than three times the upper limit of normal). 4. Patients with severe kidney injury or end-stage renal disease (eGFR \< 30 mL/min/1.73 m2). 5. Participants were unable to tolerate tape adhesive around sensor placement area, or with medically documented allergy towards the adhesive (glue) of plasters, or with serious skin diseases (e.g. psoriasis vulgaris, bacterial skin diseases) around sensor placement area. 6. Mental condition rendering the subject unable to understand the nature, scope, and possible consequences of the study. 7. Pregnant, breastfeeding, women of childbearing age who are unwilling to use contraception during the study period.