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Hemoglobin A1c, commonly known as HbA1c or glycated hemoglobin, is an important blood test used to diagnose and monitor diabetes. This test measures the average blood sugar level over the past two to three months by determining the percentage of hemoglobin proteins in red blood cells that have glucose attached to them. Unlike daily blood glucose tests that provide a snapshot of sugar levels at a single moment, the HbA1c test offers a broader picture of how well blood sugar has been controlled over an extended period.

The test works by measuring how much glucose has bonded with hemoglobin in red blood cells. Since red blood cells live for approximately three months, the HbA1c test reflects average blood sugar levels during that timeframe. Higher blood glucose levels result in more glucose attaching to hemoglobin, leading to a higher HbA1c percentage. This makes it a valuable tool for healthcare providers to assess long-term glucose control and adjust treatment plans accordingly.

For diagnostic purposes, an HbA1c level below 5.7 percent is considered normal. A level between 5.7 and 6.4 percent indicates prediabetes, which means blood sugar is 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 people already diagnosed with diabetes, the general treatment goal is to maintain HbA1c levels below 7 percent, though individual targets may vary based on age, overall health, and other factors.

The HbA1c test is typically recommended at least twice a year for people with diabetes who are meeting treatment goals and have stable blood sugar control. Those who have changed their treatment plan or are not meeting their blood sugar targets may need testing more frequently, often every three months. The test requires a simple blood sample and does not require fasting, making it convenient for patients. Results help both patients and healthcare providers understand how well diabetes management strategies are working and whether adjustments to diet, exercise, or medication are needed.