Read on to learn what A1C test results mean. The A1C test measures the percentage of red blood cells with glucose-coated hemoglobin. This measurement gives doctors an idea of the person’s ...

The higher your blood sugar levels, the more glucose sticks to hemoglobin, leading to a higher A1C percentage. Because red blood cells live for about 90 days, this test gives a long-term picture ...

An A1C test result is a percentage. The higher the percentage, the higher a person’s glucose levels have been. An optimal A1C level is below 5.7%.