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AhaBulb: Stuff Everyone Should Know · ahabulb.com/diab-a1c-two-three-months

An A1C test shows your average blood sugar over about how long?

The past 2 to 3 months.

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  1. The past 2 to 3 months ✔
  2. The past 24 hours
  3. The past 2 to 3 years

Why: Sugar in the blood sticks to hemoglobin in red blood cells. Those cells are replaced about every three months, so A1C shows a long-term average instead of one moment.

Huh, didn't know that: A1C is also called hemoglobin A1C or HbA1c.

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References

Answer: The past 2 to 3 months. Sugar in the blood sticks to hemoglobin in red blood cells. Those cells are replaced about every three months, so A1C shows a long-term average instead of one moment.

  1. ADA, Understanding A1C diabetes.org/about-diabetes/a1c
    The A1C test gives you a picture of your average blood glucose level over the past 2 to 3 months.
    Checked 2026-10-09.

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Health BasicsIf someone isn't meeting their glucose goals, how often does the ADA suggest checking glycemic status?Health BasicsWhat A1C range counts as prediabetes?Health BasicsAn A1C at or above what level is used to diagnose diabetes?

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