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Hemoglobin A1c, also known as glycated hemoglobin or HbA1c, is an important laboratory test used to monitor long-term blood sugar control in people with diabetes. This test measures the percentage of hemoglobin proteins in red blood cells that have glucose attached to them. Since red blood cells typically live for about three months, the HbA1c test provides an average picture of blood glucose levels over the past two to three months. Unlike daily blood glucose monitoring that captures a single moment in time, the HbA1c test offers a broader view of how well diabetes is being managed over an extended period.

The test is performed using a simple blood sample, which can be drawn at any time of day and does not require fasting. When glucose circulates in the bloodstream, some of it naturally binds to hemoglobin in a process called glycation. The higher the blood glucose levels, the more glucose attaches to hemoglobin. For people without diabetes, normal HbA1c levels are typically below 5.7 percent. Levels between 5.7 and 6.4 percent indicate prediabetes, which means 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, the HbA1c test serves as a critical tool for monitoring treatment effectiveness. Healthcare providers generally recommend that most adults with diabetes aim for an HbA1c level below 7 percent, though target levels may vary based on individual circumstances such as age, overall health, and risk of complications. The test is usually performed at least twice a year for people whose diabetes is well controlled and meeting treatment goals. Those whose therapy has recently changed or who are not meeting their glucose targets may need testing more frequently, such as every three months.

Several factors can affect HbA1c test results and should be considered when interpreting the findings. Conditions that affect red blood cell turnover, such as anemia, recent blood loss, or blood transfusions, can lead to inaccurate results. Certain genetic variants of hemoglobin and kidney or liver disease may also influence test outcomes. Additionally, the HbA1c test may not accurately reflect blood sugar control in pregnant women or people with certain forms of hemoglobin disorders. In these cases, alternative testing methods may be more appropriate for monitoring glucose levels.