A blood test estimating your average glucose over the past two to three months.
A1C measures the share of hemoglobin in your red blood cells that has glucose attached. Because those cells live about three months, it reflects your average glucose over that window: a single number that smooths out daily ups and downs.
General reference points: below 5.7% is typical, 5.7–6.4% suggests prediabetes, and 6.5% or above is in the diabetes range. Your own targets are a conversation for you and your clinician.
Learn what the reference numbers mean, then track your own logged readings and their share in your selected range. GMI and estimated A1C are withheld when source and coverage are unvalidated.
Educational content maintained by the SteadyRange. Source and terminology check: September 30, 2026. Independent clinical review is pending; no clinical reviewer credentials are claimed.