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)