A range of 4 to 7 mmol/l (72 to 126 mg/dl) before a meal is normal. Continual fasting levels of 5.5 to 7 mmol/l (101-125 mg/dl) causes concern of possible prediabetes and may be worth monitoring. 7 mmol/l (126 mg/dl) and above means a risk of diabetes.[citation needed]
After a 12 hour fast, a range of 3.9 to under 5.5 mmol/l (70.2 to 100 mg/dl) is normal (a level of 5.6 to under 7 mmol/l (100 to 126 mg/dl) is considered a sign of prediabetes).[citation needed]
http://en.wikipedia.org/wiki/Glucose_test
