This may help, from diabetes.co.uk site
Recommended target blood glucose level ranges
The International Diabetes Federation have specified the following blood glucose levels: [19]
IDF recommended target blood glucose level ranges Target Levels
by Type Before meals (pre prandial) 2 hours after (post prandial)
Non-diabetic 4.0 to 5.9 mmol/L under 7.8 mmol/L*
Type 2 diabetes 4 to 7 mmol/L under 8.5 mmol/L
Type 1 diabetes 4 to 7 mmol/L under 9 mmol/L
Children w/ diabetes 4 to 8 mmol/L under 10 mmol/L
Normal blood sugar ranges
For the majority of healthy individuals, normal blood sugar levels are as follows:
The normal blood glucose level in humans is about 4 mM (4 mmol/L or 72 mg/dL)
The body, when operating normally, restores the blood sugar level to a range of about 4.4 to 6.1 mmol/L (82 to 110 mg/dL)
Shortly after eating the blood glucose level may rise temporarily up to 7.8 mmol/L (140 mg/dL)