Normal Fasting Blood Sugar
A normal fasting blood sugar (which is also the blood sugar a normal person will see right before a meal) is:
83 mg/dl (4.6 mmol/L) or less.
Many normal people have fasting blood sugars in the mid and high 70 mg/dl (3.9 mmol/L) range.
Though most doctors will tell you any fasting blood sugar under 100 mg/dl (5.6 mmol/L) is ”normal”, there are several studies that suggest that testing with a fasting blood sugar in the mid 90 mg/dl (5 mmol/L) range often predicts diabetes that is diagnosed a decade later.
Post-Meal Blood Sugar (Postprandial)
Independent of what they eat, the blood sugar of a truly normal person is:
Under 120 mg/dl (6.6 mmol/L) one or two hours after a meal.
Most normal people are under 100 mg/dl (5.5 mmol/L) two hours after eating.
A truly normal A1c is between 4.6% and 5.4%
A1cs are not as good a measure of actual blood sugar control in individuals as they are for groups. An A1c of 5.1% maps to an average blood sugar of 100 mg/dl (5.6 mmol/L) or less when group statistics are analyzed, but normal variations in how our red blood cells work make the A1cs of truly normal individuals fall into a wider range.
Some people’s A1cs are always a bit higher than their measured blood sugars would predict. Some are always lower. NOTE: If you are anemic your A1c will read much lower than your actual blood sugars and the resulting A1c is not a useful gauge of your actual blood sugar control.
LOW BLOOD SUGAR TREATMENT
When you are low, you should check your blood sugar level as soon as possible. However, go ahead and treat yourself for low blood sugar if your monitoring equipment (blood glucose meter, test strips, lancet) is not readily available. Treat yourself quickly, especially if your blood sugar is less than 40 mg/dL (2.2 mmol/L).
- If your blood sugar is 51 to 70 mg/dL (2.8 to 3.9 mmol/L), eat 10 to 15 grams of fast-acting carbohydrate (eg, 1/2 cup fruit juice, 6 to 8 hard candies, 3 to 4 glucose tablets).
- If you are less than 50 mg/dL (2.8 mmol/L), eat 20 to 30 grams of fast-acting carbohydrates.
Obs: Low blood sugar is generally defined as a blood sugar of 60 mg/dL (3.3 mmol/L) or less.