Which value would best represent a typical pre-meal blood glucose level for an adult without diabetes?

• A. 60 mg/dL
• B. 90 mg/dL
• C. 160 mg/dL
• D. 250 mg/dL

Answer: (B)

A pre-meal glucose level in a healthy adult typically falls in the roughly 70–99 mg/dL range. A value around 90 mg/dL sits squarely within that normal pre-meal range, representing what a non-diabetic person would commonly have right before eating.

A reading of 60 mg/dL would be considered low and could indicate hypoglycemia, not a typical baseline for someone without diabetes. A value of 160 mg/dL is higher than normal fasting and suggests an elevated pre-meal level or a post-meal spike, which isn’t typical before eating. A glucose of 250 mg/dL is markedly high and would be a sign of significant hyperglycemia, consistent with diabetes or acute illness.