Understanding Normal Blood Sugar Levels: Ranges & What They Mean

Normal blood sugar test results vary slightly depending on the laboratory performing the test, but generally fall within the following ranges:

Fasting blood glucose: 70–99 milligrams per deciliter (mg/dL)

Random blood glucose: Less than 140 mg/dL

Oral glucose tolerance test (OGTT):

- Fasting blood glucose: Less than 100 mg/dL

- 2-hour postprandial blood glucose: Less than 140 mg/dL

Prediabetes is diagnosed if your fasting blood glucose is between 100 and 125 mg/dL, or if your 2-hour postprandial blood glucose is between 140 and 199 mg/dL.

Diabetes is diagnosed if your fasting blood glucose is 126 mg/dL or higher, or if your 2-hour postprandial blood glucose is 200 mg/dL or higher.

It's important to note that these are general guidelines and your doctor may interpret your results differently based on your individual health status and other factors. Always consult with your doctor to understand your specific test results and what they mean for you.