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Hemoglobin A1c, commonly known as HbA1c or glycated hemoglobin, is a crucial blood test used to measure average blood sugar levels over the past two to three months. This test works by measuring the percentage of hemoglobin proteins in red blood cells that have glucose attached to them. Since red blood cells live for approximately three months, the HbA1c test provides a long-term picture of blood sugar control, making it particularly valuable for diagnosing and monitoring diabetes.

The HbA1c test is primarily used for two purposes: diagnosing diabetes and prediabetes, and monitoring how well diabetes is being managed in people already diagnosed with the condition. For diagnosis, an HbA1c level below 5.7 percent is considered normal, a level between 5.7 and 6.4 percent indicates prediabetes, and a level of 6.5 percent or higher on two separate tests indicates diabetes. For people with diabetes, the general target is usually below 7 percent, though individual goals may vary based on age, overall health, and other factors.

One of the major advantages of the HbA1c test is that it does not require fasting, making it more convenient than traditional glucose tests. The test can be performed at any time of day, and recent meals do not affect the results. This is because the test measures long-term glucose exposure rather than current blood sugar levels. However, certain conditions can affect the accuracy of HbA1c results, including anemia, hemoglobin variants, recent blood transfusions, chronic kidney disease, and certain medications.

Healthcare providers typically recommend HbA1c testing at least twice a year for people with diabetes who are meeting treatment goals and have stable blood sugar control. For those whose treatment has changed or who are not meeting their goals, testing may be recommended more frequently, such as every three months. Regular HbA1c testing helps both patients and healthcare providers make informed decisions about diabetes management and treatment adjustments.