The normal blood glucose level is between

• A. 60-80 mg/dL.
• B. 80-120 mg/dL.
• C. 160-200 mg/dL.
• D. 30-150 mg/dL

Answer: (B)

Glucose levels are kept in a tight range to supply energy to tissues (especially the brain) while avoiding symptoms of too little or too much sugar in the blood. In healthy individuals, fasting glucose is typically around 70–99 mg/dL, and after a meal it can rise, but usually stays below about 140 mg/dL. Clinically, a practical normal range is often cited as about 80–120 mg/dL, which captures both typical fasting and post-meal levels without venturing into ranges that indicate hypoglycemia (too low) or hyperglycemia/diabetes (too high). An interval like 60–80 mg/dL or 30–150 mg/dL would include hypoglycemic values, while 160–200 mg/dL reflects elevated blood sugar associated with impaired glucose tolerance or diabetes, making them less representative of normal physiology.