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Normal level of blood glucose for adults ranges from 70 to 99 mg/dL (3.9-5.9 mmol/L). From 100 to 125 mg/dL (6.0-7.0)is considered impaired fasting glucose (some people call it "pre-diabetes") and 126 mg/dL (7.1 mmol/L) and above is diabetes. Everyone's blood glucose will rise after a meal and normal levels 2 hours after a meal should be no more than 135-140 mg/dL (8.0-8.9 mmol/L).
A blood glucose reading below 40 mg/dL (2.2 mmol/L) needs immediate attention since the person may lose consciousness. This is a medical emergency. Above 180-200 mg/dL (about 10-11 mmol/L) the kidneys can no longer reabsorb glucose and it spills into the urine.
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