Fasting blood sugar on your report
Often listed as FBS or glucose fasting, in mg/dL. CDC lists:
- 99 mg/dL or below as normal
- 100 to 125 mg/dL as prediabetes
- 126 mg/dL or above as diabetes
Ranges can vary slightly by lab, so check the range printed on your report.
Want the numbers? Fasting blood sugar normal range, in mg/dL and mmol/L.
- Normal below 100 mg/dL
- Prediabetes 100 to 125 mg/dL
- Diabetes range 126 mg/dL or more
By the American Diabetes Association's cut-offs. Scale in mg/dL.
Fasting blood sugar: the amount of glucose in your blood after you have not eaten anything, usually overnight.
What fasting blood sugar tells your doctor
Fasting blood sugar is one of the main tests doctors use to spot prediabetes and type 2 diabetes.
How it works:
- When you are fasting, your liver releases a little sugar and insulin keeps it in check.
- If this number keeps creeping up, it can be an early sign that insulin is not working as well as it should, which is called insulin resistance.
What moves your fasting blood sugar
A lighter, earlier dinner with protein and vegetables, rather than a late heavy plate of rice or rotis, often helps the morning number.
These all improve how your body handles sugar overnight:
- regular activity
- a short walk after dinner
- steady weight loss if you carry extra weight around the waist
- seven to eight hours of sleep
Stress and poor sleep can push it up. If you are on diabetes medicine, any changes should be planned with your doctor.
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Checked against: CDC: Diabetes Testing. General information, not medical advice.
Related words
HbA1cPostprandial blood sugarPrediabetesInsulin resistanceGlucosemg/dLGestational diabetesMethi watermmol/LMeal timing
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Where it comes up
Sample diet charts
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