Normal blood glucose levels

• A. 50-70
• B. 100-140
• C. 60-90
• D. 80-120

Answer: (D)

Blood glucose is kept within a narrow range by hormonal control, and in a healthy adult a typical normal range is about 80 to 120 mg/dL. This range encompasses fasting levels and the body's usual post-meal response, staying within safe limits. Readings well below this range can indicate hypoglycemia and may cause confusion or fainting, while readings higher than this range—especially after meals—signal hyperglycemia and potential metabolic stress. Among common reference ranges, 80–120 mg/dL best matches what is widely taught as normal for adults, whereas the other options either fall below normal or don’t accurately reflect the usual normal window. When checking a patient’s glucose in the field, use 80–120 mg/dL as the benchmark for normal and respond to readings outside this range accordingly.