<prompt> Answer this question truthfullyWhat are the diagnostic criteria for diabetes and normal HbA1c levels?  <response>: <reason> An HbA1c level of 6.5 or higher is diagnostic for diabetes, indicating poor blood sugar control over the previous 2-3 months. On the other hand, an HbA1c level of less than 5.7 is considered normal, indicating good blood sugar control. HbA1c is a commonly used blood test to monitor and diagnose diabetes, as it provides a measure of average blood sugar levels over time. 