According to    ASK,    (http://www.ask.com/bar?q=normal+blood+sugar+levels&page=1&qsrc=121&ab=1&u=http%3A%2F%2Fwww.cnn.com%2FHEALTH%2Flibrary%2FSA%2F00102.html)
"What is a fasting blood sugar test?
A fasting blood sugar test measures the amount of sugar in your blood after you fast for at least eight hours or overnight.
What's normal?
A normal fasting blood sugar result is lower than 100 milligrams of glucose per deciliter of blood (mg/dL).
What level suggests prediabetes?
If your fasting blood sugar level is 100 mg/dL to 125 mg/dL, you have impaired fasting glucose — commonly known as prediabetes. To confirm the diagnosis, your doctor may repeat the fasting blood sugar test several days to a week later.
What level suggests type 1 or type 2 diabetes?
A fasting blood sugar level of 126 mg/dL or higher is consistent with either type 1 or type 2 diabetes when accompanied by classic signs and symptoms of diabetes — increased thirst or hunger, frequent urination, weight loss or blurred vision.
Random blood sugar test
What is a random blood sugar test?
A random blood sugar test measures your blood sugar at any point in time, not necessarily a certain amount of time after a meal, snack or beverage.
What's normal?
A normal random blood sugar level hasn't been clearly defined. However, even if you've recently eaten and your blood sugar level is at its peak, your random blood sugar level shouldn't be higher than 200 mg/dL.
What level suggests prediabetes?
If your random blood sugar level is higher than 140 mg/dL but lower than 200 mg/dL, you may have prediabetes.
What level suggests type 1 or type 2 diabetes?
A random blood sugar level higher than 200 mg/dL suggests either type 1 or type 2 diabetes"