Fasting blood glucose normal range
Pro Research Analysisby 
Searched over 200M research papers
Fasting Blood Glucose Normal Range in Adults
Fasting blood glucose (FBG) is a key measure for assessing metabolic health and diagnosing diabetes. The normal range for fasting blood glucose in healthy adults is generally considered to be between 70 and 100 mg/dL (3.9–5.6 mmol/L) 410. Some sources slightly expand this range, noting that normal values can be between 80 and 120 mg/dL, but the most widely accepted upper limit is 100 mg/dL .
International and Population-Specific Reference Ranges
Studies have shown that the normal FBG range can vary by population. For example, a study in Sudanese adults found a lower normal range, with FBG values between 60.5 and 88.1 mg/dL, which is below many international reference intervals . This highlights the importance of considering local population data when interpreting FBG results.
Fasting Blood Glucose and Health Risks
Even within the normal range, higher fasting blood glucose levels are associated with increased health risks. Multiple large studies have found that FBG levels in the upper normal range (91–99 mg/dL) are linked to a higher risk of developing type 2 diabetes and cardiovascular disease compared to those with lower normal FBG levels 3678+1 MORE. For instance, individuals with FBG between 95–99 mg/dL have more than double the risk of developing diabetes compared to those with FBG below 85 mg/dL 68. Similarly, cardiovascular risk is higher for those with FBG above 85 mg/dL, even if they are not diabetic 79.
Fasting Blood Glucose in Special Populations
In children and newborns, normal fasting blood glucose values are slightly different. After the first few days of life, normal values align with those of older children and adults, typically ranging from 3.5 to 5.5 mmol/L (63–99 mg/dL) .
Factors Affecting Fasting Blood Glucose Measurements
Several factors can influence FBG readings, including the method of measurement, duration of fasting, and sample source. For example, blood drawn from different sites or measured with different techniques can yield slightly different results . These technical factors should be standardized for accurate assessment.
Conclusion
The normal fasting blood glucose range for healthy adults is typically 70–100 mg/dL, though this can vary by population and measurement method 45102. Higher values within this range are associated with increased risk for diabetes and cardiovascular disease, emphasizing the importance of monitoring even “normal” FBG levels for early detection and prevention of metabolic disorders 3678+1 MORE.
Sources and full results
Most relevant research papers on this topic