What fasting glucose level indicates a normal classification?

A fasting glucose level of less than 100 mg/dl indicates a normal classification. This threshold is widely accepted in clinical guidelines for defining normal glucose metabolism. Levels within this range signify that the individual's glucose regulation is functioning properly without indications of prediabetes or diabetes mellitus.

Fasting glucose levels between 100 to 125 mg/dl are considered to be in the prediabetes range, signifying that the person's glucose levels are elevated but not high enough to be classified as diabetes. A fasting glucose level of 125 mg/dl or greater is diagnostic for diabetes, indicating a significant impairment in glucose regulation. The option stating less than 140 mg/dl pertains to glucose tolerance testing rather than fasting glucose levels specifically, further clarifying the distinction between these different classifications.