A range of 4 to 7 mmol/l (72 to 126 mg/dl) before a meal is normal. Continual fasting mg/dl of 100 or higher causes concern of possible prediabetes and may be worth monitoring.
A level of < 10 mmol/l (180 mg/dl) 90 minutes after a meal is normal.
A range of 7 to 8 mmol/l (126 to 144 mg/dl) at bedtime is normal.
After a 12 hour fast, a range of 3.9 to 6.5 mmol/l (70.2 to 117 mg/dl) is normal. (a level of 6.7 to 7 mmol/l (120.6 to 126 mg/dl) is considered a sign of prediabetes)