Blood glucose 7.66 is fasting blood glucose, belongs to the category of high blood glucose, whether it affects the entry into the workplace should consult the appropriate work unit, it is recommended to go to the hospital in a timely manner. The normal value of fasting blood glucose is 3.9-6.1mmol/L, 2 hours after meal blood glucose is less than 7.8mmol/L, so the fasting blood glucose 7.66mmol/L, belongs to the category of high blood glucose, but a one-time high blood glucose can not be diagnosed as diabetes mellitus, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to improve the oral glucose tolerance test and other tests, to clarify the diagnosis. A single blood sugar of 7.66mmol/L, it is recommended to test again or go to the hospital to improve the examination, to avoid other adverse consequences, which will affect the life.