HbA1c is used in the diagnosis of diabetes and prediabetes. It reflects average blood glucose levels over the past 2-3 months, providing a more stable and reliable measure compared to daily glucose monitoring. It's particularly useful for monitoring long-term glycemic control in diabetic patients.

For individuals with diabetes, HbA1c levels serve as a marker of average blood glucose levels over time. Regular monitoring helps healthcare providers assess the effectiveness of treatment plans and make adjustments as necessary to achieve target levels and prevent complications.

Elevated HbA1c levels are associated with an increased risk of diabetes-related complications such as cardiovascular disease, nephropathy, retinopathy, and neuropathy. Monitoring HbA1c levels helps identify patients at higher risk of developing these complications and allows for early intervention to prevent or delay their onset.

HbA1c levels guide treatment decisions in diabetes management. Lowering HbA1c levels through lifestyle changes, medication adjustments, and other interventions reduces the risk of long-term complications and improves overall health outcomes.