According to the critical values list, what is the critical glucose range?

• A. 40-500 mg/dL
• B. 60-140 mg/dL
• C. 20-80 mg/dL
• D. 0-100 mg/dL

Answer: (A)

Critical values are extreme lab results that require immediate action because they indicate potentially life‑threatening conditions. For glucose, the danger lies both in severe hypoglycemia and in extreme hyperglycemia. In many critical-values lists, the safe reporting window is 40–500 mg/dL, so any result outside this range is considered critical and must be reported right away. Therefore, the range 40–500 mg/dL best represents the threshold used to flag critical glucose results.