What is the normal range for fasting glucose levels?

• A. 60 mg/dL - 100 mg/dL
• B. 80 mg/dL - 120 mg/dL
• C. 90 mg/dL - 140 mg/dL
• D. 70 mg/dL - 115 mg/dL

Answer: (D)

Fasting glucose shows how well your body keeps blood sugar balanced after you haven’t eaten overnight. A normal result means glucose stays in a fairly tight range because insulin is working to move sugar into cells.

Most people have fasting glucose around 70–99 mg/dL. Some clinical references round the upper end a bit higher, up to about 110–115 mg/dL, and that broader range is still considered normal in certain contexts. Diabetes is typically diagnosed if fasting glucose is 126 mg/dL or higher on two separate tests. Between 100 and 125 mg/dL is often labeled impaired fasting glucose (prediabetes), indicating higher risk but not yet diabetes.

So the option spanning roughly 70–115 mg/dL aligns with the idea of a typical normal fasting level and stays below the diabetes threshold, which is why it’s marked as correct here.