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Hemoglobin A1c, commonly known as HbA1c or glycated hemoglobin, is a laboratory test that measures the average blood sugar levels over the past two to three months. This test is essential for diagnosing and monitoring diabetes. When glucose circulates in the bloodstream, it attaches to hemoglobin, the protein in red blood cells that carries oxygen throughout the body. The higher the blood glucose levels, the more glucose binds to hemoglobin. Since red blood cells typically live for about three months, the HbA1c test provides a picture of average glucose levels during that timeframe.

The HbA1c test results are reported as a percentage. For people without diabetes, a normal HbA1c level is typically below 5.7 percent. Levels between 5.7 and 6.4 percent indicate prediabetes, a condition where blood sugar levels are higher than normal but not yet high enough to be classified as diabetes. An HbA1c level of 6.5 percent or higher on two separate tests indicates diabetes. For individuals already diagnosed with diabetes, healthcare providers generally recommend keeping HbA1c levels below 7 percent to reduce the risk of complications, though target levels may vary based on individual circumstances.

Unlike daily blood glucose monitoring that shows immediate fluctuations, the HbA1c test is not affected by short-term changes such as stress, illness, or recent meals. This makes it a reliable indicator of long-term glucose control. The test requires a simple blood sample and does not require fasting, making it convenient for patients. It can be performed at any time of day and is often done during routine medical checkups.

Regular HbA1c testing is crucial for people with diabetes to assess how well their treatment plan is working. Most individuals with diabetes should have this test done at least twice a year if their blood sugar levels are stable and meeting treatment goals. Those whose treatment has recently changed or who are not meeting their glucose targets may need testing more frequently, typically every three months. By monitoring HbA1c levels, patients and healthcare providers can make informed decisions about medication adjustments, lifestyle modifications, and overall diabetes management strategies.