What is the normal blood sugar value of adults?

The reference values of normal blood glucose are: fasting blood glucose: 3.9-6.2 mmol/L, 1 hour after meals: 7.8-9.0 mmol/L, 2 hours after meals: 3.9-7.8 mmol/L. Generally, blood glucose is checked on an empty stomach and 2 hours after meals. It's best to go to the hospital for examination, so that the results will be more accurate.