Pre-meal blood glucose at 7.4mmol/L is abnormal, is abnormal blood glucose, and significantly high. Pre-dinner blood glucose is fasting blood glucose, and fasting blood glucose up to 7.4mmol/L is abnormal blood glucose. If a patient with no previous diagnosis of diabetes has a pre-dinner fasting blood glucose of 7.4mmol/L, diabetes can be diagnosed because the normal range of fasting blood glucose is 3.9-6.1mmol/L, and the current blood glucose is significantly higher than 7.1mmol/l, which can be diagnosed as diabetes. If diabetes has been diagnosed in the past, and taking glucose-lowering drugs, it means that the blood sugar control is not satisfactory, and need to strengthen the adjustment of blood sugar medication, you can use glucose-lowering drugs with insulin treatment, or use insulin to control blood sugar.