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Hemoglobin A1c, commonly known as HbA1c or glycated hemoglobin, is a blood test that measures the average blood sugar levels over the past two to three months. This test is essential for diagnosing and monitoring diabetes, as it provides a longer-term view of blood glucose control compared to daily blood sugar measurements. When glucose circulates in the bloodstream, it binds to hemoglobin, the protein in red blood cells that carries oxygen. The higher the glucose levels in the blood, the more glucose attaches to hemoglobin. Since red blood cells live for approximately three months, the HbA1c test reflects the average amount of glucose that has been present in the blood during that period.

The HbA1c test is valuable for both diagnosing diabetes and assessing how well diabetes is being managed. For diagnosis, an HbA1c level of 6.5 percent or higher on two separate tests indicates diabetes, while a level between 5.7 and 6.4 percent suggests prediabetes, a condition where blood sugar levels are higher than normal but not yet high enough to be classified as diabetes. A normal HbA1c level is below 5.7 percent. For people already diagnosed with diabetes, the HbA1c test helps determine whether current treatment plans are effective in controlling blood sugar levels. Most diabetes treatment guidelines recommend that individuals with diabetes aim for an HbA1c level below 7 percent, though target levels may vary depending on individual circumstances and health conditions.

One of the main advantages of the HbA1c test is that it does not require fasting, making it more convenient than traditional glucose tests. Patients can have their blood drawn at any time of day without needing to prepare beforehand. The test requires only a small blood sample, typically drawn from a vein in the arm, though some point-of-care devices can measure HbA1c from a fingerstick sample. Results are usually available within a few days when sent to a laboratory, or within minutes when using point-of-care testing devices in a healthcare setting.

Healthcare providers typically recommend that people with diabetes have their HbA1c tested at least twice a year if their blood sugar levels are stable and they are meeting treatment goals. If diabetes treatment has recently changed or if blood sugar levels are not well controlled, more frequent testing every three months may be necessary. For individuals without diabetes but with risk factors such as obesity, family history of diabetes, or a history of gestational diabetes, periodic HbA1c testing may be recommended as part of routine health screening. Understanding HbA1c levels and working with healthcare providers to maintain them within target ranges is crucial for preventing or delaying diabetes-related complications affecting the eyes, kidneys, nerves, and cardiovascular system.