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AhaBulb: Stuff Everyone Should Know · ahabulb.com/diab-a1c-diagnosis

An A1C at or above what level is used to diagnose diabetes?

6.5% or higher is in the diabetes range.

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  1. 5.0%
  2. 5.7%
  3. 6.5% ✔

Why: An A1C of 6.5% or higher is in the diabetes range, while 5.7% is where prediabetes starts. Doctors usually confirm a diagnosis with a repeat test.

Huh, didn't know that: You don't have to fast or drink anything special before an A1C test.

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References

Answer: 6.5%. An A1C of 6.5% or higher is in the diabetes range, while 5.7% is where prediabetes starts. Doctors usually confirm a diagnosis with a repeat test.

  1. ADA, Diabetes Diagnosis diabetes.org/about-diabetes/diagnosis
    Diabetes is diagnosed at an A1C of greater than or equal to 6.5%
    Checked 2026-10-09.

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