What is normal blood sugar?

Fasting: 70-100 mg: If have not eaten or drank anything, except for water, for an eight hour period, this fasting blood sugar level is about 70-100. An hour after earing it may peak to about 170, and by two hours it should return to about normal fasting levels. If two or three fasting sugars are between 100-126, it is called 'impaired glucose tolerance'. If repeated FBS is over 126, it is considered type 2 diabetes.

It depends: Most labs have a reference range of 60-99 for fasting glucose (blood sugar) . 100-125 is concidered to be at increased risk of type 2 diabetes. A fasting glucose in presumed to be diabetes in certain situations. There are also ranges for non fasting sugar.

Blood sugar: For the majority of healthy individuals, normal blood sugar levels are as follows: Between 4.0 to 6.0 mmol/L (72 to 108 mg/dL) when fasting Up to 7.8 mmol/L (140 mg/dL) 2 hours after eating https://www.diabetes.co.uk/diabetes_care/blood-sugar-level-ranges.html