What Is HbA1c (Glycated Hemoglobin)?

What it is

HbA1c is hemoglobin with glucose attached, reflecting average blood glucose over the preceding 2–3 months.

Why it matters

The standard marker for diabetes diagnosis and long-term glucose control monitoring.

Specimen

Whole blood (fingerstick)

Interpretation

Reflects average glucose over ~2–3 months; % used for diabetes diagnosis/control.

Limitations

Affected by hemoglobin variants and anemia.

Related test: HbA1c Rapid Test — specimen: WB