Understanding Healthy Blood Sugar Levels: Ranges & Definitions

Fasting blood sugar

* Normal: Less than 100 mg/dL (5.6 mmol/L)

* Prediabetes: 100 to 125 mg/dL (5.6 to 6.9 mmol/L)

* Diabetes: 126 mg/dL (7.0 mmol/L) or higher on two or more occasions

Two-hour postprandial blood sugar (two hours after a meal)

* Normal: Less than 140 mg/dL (7.8 mmol/L)

* Prediabetes: 140 to 199 mg/dL (7.8 to 11.0 mmol/L)

* Diabetes: 200 mg/dL (11.1 mmol/L) or higher

Please note that the definition of normal, prediabetes, and diabetes may vary slightly between different sources. It's always best to discuss your blood sugar levels with your doctor to get a personalized interpretation of your results.