There is no such thing as “fasting blood glucose of 15.0 mmol/L belongs to several levels of diabetes”, because there is no classification of diabetes, but there are types of diabetes, mainly type 1 diabetes, type 2 diabetes, gestational diabetes, and other special types of diabetes, etc., but only based on the fasting blood glucose concentration can not determine the type of diabetes. The normal range of fasting blood glucose is between 1.5 and 2.5 meters. The normal range of fasting blood glucose is 3.9 to 6.1 mmol/L, and 7 mmol/L is the standard for diabetic blood glucose. When the fasting blood glucose 15 point a few mmol / L, reached the diagnosis of diabetes, and blood glucose value is significantly high, need to be careful of diabetes combined with ketoacidosis occurs, should go to the hospital immediately. The type of diabetes can be determined by the C-peptide release test, insulin release test and other tests, and it is not possible to determine the type of diabetes only by the fasting blood glucose concentration. If you have abnormal blood glucose levels, it is recommended that you go to the hospital and receive treatment under the direction of your doctor.