Hemoglobin A1c Test
Your average blood sugar over the past 2–3 months. The gold standard for diabetes screening and monitoring.
What is Hemoglobin A1c?
Your average blood sugar over the past 2–3 months. The gold standard for diabetes screening and monitoring.
Hemoglobin A1c Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| age 18+ | 4.00 – 5.60 % |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your Hemoglobin A1c result may mean
5.7–6.4% indicates prediabetes; 6.5% or higher on two tests suggests diabetes. Even small reductions improve long-term risk.
Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
Related Diabetes & Blood Sugar biomarkers
Markers commonly tested alongside Hemoglobin A1c.
Frequently asked
No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor.
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