What HbA1c range defines prediabetes?

• A. 4.0–5.4%
• B. 5.7–6.4%
• C. 6.5–7.4%
• D. 7.5–8.4%

Answer: (B)

HbA1c shows how much glucose has been carried in the blood over roughly the past 2–3 months. Prediabetes is defined as an HbA1c of 5.7% to 6.4% because this range sits between normal levels and the diabetes threshold, flagging people who have impaired glucose regulation and are at higher risk of developing type 2 diabetes. Values below 5.7% are considered normal, while 6.5% or higher indicates diabetes. So the 5.7%–6.4% range best identifies those at increased risk who can benefit from preventive measures like lifestyle changes.