Fasting glucose 6.15mmol/L First, the cause of the slightly high blood glucose should be clarified and then treated according to the cause. If the cause is a large amount of sugary food the day before, there is usually no need to take medication. If the cause is pathological, it is necessary to consult a doctor in time to clarify whether there are abnormalities in glucose metabolism, and then follow the doctor’s advice to treat and take medication if necessary. The diagnostic criteria for diabetes mellitus are fasting blood glucose ⩾7.0mmol/L, 2-hour postprandial blood glucose ⩾11.1mmol/L and typical symptoms of diabetes. Fasting blood glucose ⩾6.15 mmol/L does not meet the diagnostic criteria for diabetes mellitus, but is slightly above normal. It is recommended that the patient further improve the glucose tolerance test, review the fasting blood glucose, postprandial 2-hour blood glucose and other related examinations to clarify whether there is diabetes mellitus. It is recommended to maintain a good lifestyle, avoid high sugar foods, increase exercise, and monitor blood glucose. If the blood glucose still cannot return to the normal range after lifestyle adjustments, it is recommended to go to the hospital in time for treatment with the help of the doctor.