The aim of the study is to assess the effect of FGM on glycemic control compared with SMBG using a randomised controlled study design in adults with type 2 diabetes.

Flash glucose monitoring (FGM) is a newly introduced Glucose Monitoring system. The aim of the study is to assess the effect of FGM on glycemic control compared with standard blood glucose monitoring (SMBG) using a randomised controlled study design in adults with type 2 diabetes. Subjects will use unmasked FGM once a month or SMBG to monitor glucose level for 3 months. Patients in the SMBG group will wear masked FGM to collect glycaemic variability data for comparison to the intervention group of the study. The primary outcome, HbA1c, will be cpmpared at baseline and 3 month. Glucose control parameters provided by unmasked and masked FGM will be compared in the two groups, including mean blood glucose (MBG), coefficient of variation (CV), area under the curve (AUC), Time in Range(TIR), etc.

Inclusion Criteria:

1. >18 years old;
2. diagnosed as having diabetes who were willing to perform the study and complete the data collection;
3. in stable condition prior to the study.

Exclusion Criteria:

1. pregnancy or attempting to conceive;
2. known allergy to medical grade adhesive or isopropyl alcohol used to prepare the skin;
3. skin lesions, scarring, redness, infection, or edema at the sensor application sites;
4. patients whose conditions were extremely severe and not stable.