


Alternately, they may be reported as estimated average glucose (eAG), in milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L).īlood glucose meters and continuous glucose monitors also give eAG readings, some from at least 12 days of data. Traditionally, A1C levels are reported as a percentage. In this case, the person still needs to undergo regular A1C testing. If a person takes insulin to manage diabetes, their doctor may also ask them to monitor their blood glucose levels at home with a blood glucose meter or continuous glucose monitor. monitor the blood glucose levels of a person with diabetes to check how well their treatment is working.
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Undergoing the A1C test is straightforward: A healthcare professional takes a blood sample and sends it to a laboratory for testing. The more glucose in a person’s bloodstream, the more hemoglobin is bound to glucose. When glucose enters the blood, it binds to hemoglobin. It helps carry oxygen from the lungs to other tissues.

Hemoglobin is an iron-rich protein in red blood cells. This measurement gives doctors an idea of the person’s average blood glucose levels over the past 2–3 months. The A1C test measures the percentage of red blood cells that have glucose-coated hemoglobin.
