What A1C level indicates diabetes?

An A1C level of 6.5% or higher is indicative of diabetes. This specific threshold is established by the American Diabetes Association as part of the diagnostic criteria for diabetes. The A1C test measures the average blood glucose levels over the past two to three months, providing insight into a person's long-term glucose control.

When the A1C level reaches 6.5% or above, it reflects a consistent elevation in blood sugar levels, confirming that the individual meets the criteria for diabetes. This is essential for timely management and intervention, as diabetes can lead to serious health complications if left uncontrolled.

The other ranges listed do not qualify as diabetes diagnoses. An A1C below 5.7% is considered normal, while levels between 5.7% and 6.4% are classified as prediabetes, indicating a higher risk of developing diabetes in the future but not confirming the diagnosis itself. An A1C level of 7.0% to 7.9% suggests a more advanced state of diabetes, but it is already established at 6.5% that the condition is present. Thus, the most definitive indicator of diabetes among the options is 6.5% or higher.