What Is a Normal HbA1c Level?
The normal HbA1c range is 4.0–5.6% (normal). Values below or above this range may indicate a condition that requires further evaluation.
Reference Range Table
| Marker | Low | Normal | High |
|---|---|---|---|
| HbA1c | Below 4.0% — unusually low, may indicate blood disorder | 4.0–5.6% (normal) | 5.7-6.4% prediabetes; 6.5%+ diabetes |
What Affects Your Results
Conditions affecting red blood cell turnover (anemia, sickle cell disease, recent blood loss/transfusion), pregnancy, kidney disease, and certain medications can affect HbA1c accuracy independently of actual blood sugar levels.
When to Retest
If managing diabetes, every 3 months. For prediabetes monitoring, every 6 months. For routine screening, annually if you have risk factors.
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