What is the normal range for fasting blood glucose?
May 23, 2025
Source: Cainiu Health
Dr. Liu Feng
Introduction
Fasting blood glucose testing requires at least 8 hours without caloric intake, typically performed in the morning before breakfast. The normal fasting blood glucose range for healthy individuals is 3.9–6.1 mmol/L, reflecting the balance between hepatic glycogen output and insulin regulation. If levels fall below 3.9 mmol/L, hypoglycemia may be indicated and should be assessed in conjunction with symptoms such as palpitations and tremors.
The normal range for fasting blood glucose is generally 3.9–6.1 mmol/L.
Fasting blood glucose testing requires at least 8 hours without caloric intake, usually performed before breakfast in the morning. The normal fasting blood glucose range for healthy individuals is 3.9–6.1 mmol/L, reflecting a balance between hepatic glycogen output and insulin regulation. If levels fall below 3.9 mmol/L, hypoglycemia may be present, and intervention should be considered based on symptoms such as palpitations and tremors.
When fasting blood glucose is between 6.1–7.0 mmol/L, it is classified as "impaired fasting glucose" (IFG), indicating prediabetes. Although there may be no obvious symptoms at this stage, glucose metabolism is already abnormal, and there is a risk of progressing to diabetes. It is recommended to implement interventions such as dietary control and increased physical activity and to undergo regular oral glucose tolerance tests.
If fasting blood glucose is ≥7.0 mmol/L, accompanied by symptoms such as polydipsia, polyphagia, polyuria, and weight loss, or if two separate tests on different days meet this threshold, a diagnosis of diabetes can be made. Conditions such as stress (e.g., infection) or drug interference should be ruled out, and diagnosis should be confirmed using indicators such as glycated hemoglobin (HbA1c). Maintaining regular作息 and a balanced diet are fundamental to maintaining normal fasting blood glucose levels.
