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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 naturally attaches to hemoglobin, the protein in red blood cells that carries oxygen throughout the body. The higher the blood sugar levels, the more glucose binds to hemoglobin. Since red blood cells typically live for about three months, the HbA1c test provides a reliable picture of average blood glucose control over that period.

For people without diabetes, a normal HbA1c level is typically below 5.7 percent. A result between 5.7 and 6.4 percent indicates prediabetes, meaning 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 those already diagnosed with diabetes, healthcare providers generally recommend keeping HbA1c levels below 7 percent to reduce the risk of complications, though individual targets may vary based on age, overall health, and other factors.

The HbA1c test offers several advantages over traditional blood glucose tests. Unlike fasting blood glucose tests that measure sugar levels at a single point in time, HbA1c provides a comprehensive overview of blood sugar control over several months. Patients do not need to fast before the test, and it can be performed at any time of day, making it more convenient. The test is not affected by short-term factors such as stress, illness, or recent meals, which can cause temporary spikes in blood sugar.

Healthcare providers use HbA1c testing for multiple purposes. It helps diagnose type 2 diabetes and prediabetes, assists in monitoring how well diabetes treatment plans are working, and guides decisions about adjusting medications or lifestyle interventions. People with diabetes typically have their HbA1c levels checked at least twice a year if they are meeting treatment goals, or more frequently if their treatment plan has changed or if they are not reaching their targets. Regular monitoring through HbA1c testing is crucial for preventing long-term complications of diabetes, including heart disease, kidney damage, nerve damage, and vision problems.