What HbA1c value is diagnostic of diabetes?

What HbA1c value is diagnostic of diabetes?

• A. 5.0%
• B. 5.7%
• C. 6.5%
• D. 6.0%

Answer: (C)

HbA1c reflects average blood glucose over the past 2–3 months. A value of 6.5% or higher is diagnostic for diabetes. Values in the range of about 5.7% to 6.4% indicate prediabetes, while below 5.7% is considered normal. In practice, the 6.5% threshold is usually confirmed with a second test on a separate day unless there are clear symptoms of hyperglycemia or a diabetes crisis.

HbA1c reflects average blood glucose over the past 2–3 months. A value of 6.5% or higher is diagnostic for diabetes. Values in the range of about 5.7% to 6.4% indicate prediabetes, while below 5.7% is considered normal. In practice, the 6.5% threshold is usually confirmed with a second test on a separate day unless there are clear symptoms of hyperglycemia or a diabetes crisis.