Above the range
Common causes of a high Hemoglobin A1c (HbA1c)
- Diabetes (poor long-term control)
- Iron-deficiency anemia (falsely high)
Looking for the other direction? See what causes a low Hemoglobin A1c (HbA1c).
All tests · Glucose & Diabetes · Hemoglobin A1c (HbA1c)
Above the range
What causes a high Hemoglobin A1c (HbA1c)?
Normal range 4-5.6 % (20-38 mmol/mol SI). Specimen: Whole blood (EDTA). See the full Hemoglobin A1c (HbA1c) reference page for critical values and nursing considerations.
What is the normal range for Hemoglobin A1c (HbA1c)?
The standard teaching reference range for Hemoglobin A1c (HbA1c) is 4-5.6 % in conventional units, or 20-38 mmol/mol in SI units. This value is measured in whole blood (edta).
| Specimen | Whole blood (EDTA) |
|---|---|
| Conventional range | 4-5.6 % |
| SI range | 20-38 mmol/mol |
| Panel | Glucose & Diabetes |
Full details, including nursing considerations, on the Hemoglobin A1c (HbA1c) normal range page. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
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