Home › Lab markers › Hemoglobin A1c
METABOLIC & HORMONE MARKERS
Also printed as: HbA1c · A1c · Glycated hemoglobin
Educational only — not medical advice.
A1c reflects how much sugar has attached to the hemoglobin in your red blood cells. Because those cells live about three months, it gives an average picture of blood sugar over roughly that period rather than a single moment. That makes it far less sensitive to what you ate this morning than a glucose test.
A1c is the closest thing to a long-exposure photograph of blood sugar, which is why clinicians lean on it. It still has blind spots — anything that changes red cell lifespan changes A1c independently of blood sugar.
TYPICAL ADULT RANGE
Many labs report below 5.7% as expected for adults, 5.7–6.4% as an intermediate band, and 6.5% or above as a threshold clinicians follow up on. Ranges vary by lab. Reported in %.
Reference ranges vary by lab, by method, and by age and sex. Always read your own result against the range printed on your report.
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A lower A1c usually reflects steady blood sugar. It can also read low for reasons unrelated to sugar: anything that shortens red cell lifespan — recent blood loss, blood donation, pregnancy, some inherited hemoglobin traits, and certain anemias — lowers it independently. If your A1c looks unexpectedly low next to your glucose readings, that mismatch is exactly what to raise with your doctor.
A rising A1c reflects higher average blood sugar over the past few months, and the everyday contributors are familiar: eating pattern, activity level, sleep, stress, body weight, and some medications including steroids. It also reads high for non-sugar reasons — iron deficiency and anything that lengthens red cell lifespan can raise it on their own. Because the number sits at a threshold that shapes real clinical decisions, an elevated A1c is something to review with your doctor, who will read it alongside your glucose and your history rather than treating one value as a verdict.
Your doctor is the one who can read this number against your history, symptoms, and medications.
Educational only — not medical advice. Lab results only mean something alongside your history, symptoms, medications, and the rest of your panel. Bring questions to your doctor; they are the one who can interpret your results for you.
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