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Hemoglobin A1c, commonly referred to as HbA1c or A1c, is a blood test that provides important information about average blood sugar levels over the past two to three months. This test measures 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 A1c test reflects the average amount of sugar that has been present in the bloodstream during that time period. This makes it a valuable tool for diagnosing diabetes and prediabetes, as well as monitoring how well blood sugar levels are being controlled in people who already have diabetes.

The A1c test is typically performed using a simple blood sample drawn from a vein in the arm, though some point-of-care devices can use a finger prick sample. One advantage of this test is that fasting is not required before the blood draw, making it more convenient than some other diabetes screening tests. The results are reported as a percentage, with normal levels generally being below 5.7 percent. A result between 5.7 and 6.4 percent indicates prediabetes, which means blood sugar levels are higher than normal but not yet high enough to be classified as diabetes. An A1c level of 6.5 percent or higher on two separate tests indicates diabetes.

For people with diabetes, the A1c test is an essential monitoring tool that is usually performed every three to six months. The target A1c level varies depending on individual circumstances, but many healthcare providers aim for a level below 7 percent for most adults with diabetes. Achieving and maintaining target A1c levels can significantly reduce the risk of diabetes-related complications affecting the eyes, kidneys, nerves, and cardiovascular system. However, the appropriate target may be different for certain individuals, such as older adults, those with other health conditions, or people at risk for low blood sugar episodes.

Several factors can affect A1c test results and should be considered when interpreting the values. Conditions that affect red blood cell turnover, such as anemia, recent blood loss, or certain genetic disorders affecting hemoglobin, can lead to falsely high or low results. Additionally, certain medications, pregnancy, and recent blood transfusions may influence test accuracy. If there are concerns about the reliability of A1c results, alternative tests such as fasting blood glucose or oral glucose tolerance tests may be used to assess blood sugar control.