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Glucose & Diabetes

Hemoglobin A1c (HbA1c)

Normal range 4-5.6 % (20-38 mmol/mol SI). Specimen: Whole blood (EDTA).

Also known as: glycated hemoglobin, A1c, glycosylated hemoglobin.

4-5.6 %Reference range

Reference range

Conventional%
45.6
SImmol/mol
2038

Combined adult band. LabVals does not publish separate men's, women's, or pediatric ranges for Hemoglobin A1c (HbA1c); those can be narrower than the band shown.

Hemoglobin A1c (HbA1c) reference range, specimen, and conversion details
SpecimenWhole blood (EDTA)
Conventional range4-5.6 %
SI range20-38 mmol/mol
PanelGlucose & Diabetes

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).

Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.

At the bedside

Nursing considerations

  • Reflects average glucose over ~2-3 months; ≥ 6.5% supports diabetes.
  • Most diabetes treatment goals target < 7%.
  • Unreliable with hemoglobinopathies or altered red-cell survival.
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