What is the normal fasting blood glucose range?

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Normal fasting blood glucose reflects how the body regulates glucose after an overnight or extended fast, when no recent meals influence blood sugar. After fasting, a healthy person’s glucose stays within a relatively tight window because insulin and liver glucose production are balanced. The range 4.0 to 6.0 mmol/L is used because it captures typical normal variation among individuals while staying clearly above levels that cause hypoglycemia and below values that raise concern for impaired glucose tolerance or diabetes. Values below 4.0 mmol/L can produce symptoms of low blood sugar, while persistent readings above about 6.0 mmol/L warrant further evaluation for impaired fasting glucose or diabetes (diabetes criteria commonly involve a higher threshold, such as 7.0 mmol/L on two occasions). So this range best fits what is considered normal for fasting glucose.