When looking at blood sugar levels they are based on age the range for 13 years old to adults needs to be between 90 to 130 mg/dl (5.0 to 7.2 mmol/L), for children aged 6 to 12 the range needs to be from 90 to 180 mg/dl (5.0 to 10 mmol/L) and children under six needs to be between 100 to 180 mg/dl (5.5 to 10 mmol/L). A glucose test will be performed to measure the glucose in your blood, the test will need to be done while fasting and if your glucose levels are within those ranges, it is normal. Higher ranges would suggest pre-diabetes or diabetes. Glucose measurements can also be done two hours after a meal, blood sugars less than 140 mg/dl (7.8mmol/L) would be in the normal range, and readings of 140 to 199 (7.8 to 11.0 mmol/L) would be considered pre-diabetes or diabetes.