What is a normal blood sugar range in mg/dL?

• A. 60-90 mg/dL
• B. 40-60 mg/dL
• C. 80-100 mg/dL
• D. 80-120 mg/dL

Answer: (D)

Normal blood sugar in a healthy adult can vary but stays within a fairly wide but controlled range. Fasting glucose is typically around 70-99 mg/dL, and after eating it should stay below about 140 mg/dL. A practical range that encompasses typical resting and post-meal values is 80-120 mg/dL. This captures the idea that you might be around the mid range when fasting and can rise into the low-to-mid 100s after a meal, without hitting the higher post-meal limits that would be considered outside the normal range. The other options either sit too low for most adults, or miss the normal post-meal variability, making them less representative of typical healthy ranges.