Random blood glucose generally does not include fasting blood glucose. Random blood glucose means that blood glucose is measured at a time that is not related to eating, and blood can be taken at any time of the day. Fasting blood glucose means fasting overnight for at least 8 hours and measuring blood glucose early the next morning before breakfast, so random blood glucose generally does not include fasting blood glucose unless the random blood glucose is tested during the time of fasting. A normal person’s random blood glucose should be less than 11.1 mmol/L. Random blood glucose reflects the current blood glucose level and is used to help determine if there is hypoglycemia or hyperglycemia at this time. The range of normal fasting blood glucose is 3.9-6.1mmol/L, which reflects the blood glucose level in the basal state. The body’s blood sugar fluctuates throughout the day and is closely related to time of day and diet. Blood glucose needs to be monitored at different times of the day to reflect the overall blood glucose level. In addition to random blood glucose and fasting blood glucose, there are also pre-meal blood glucose, 2-hour postprandial blood glucose, bedtime blood glucose, and nighttime blood glucose. Each time of blood glucose measurement has a different meaning and is used to help diagnose and treat diseases. Blood glucose testing needs to be done under the supervision of a medical professional.