Hemoglobin A1a
Hemoglobin A1a is a minor fraction of glycated hemoglobin measured by HPLC. It represents glycation of the terminal amino acid of the beta chain.
Category: Diabetes & Glycemic
Also known as: hb a1a
Reference range: 0–2 % (Source: ABIM)
Standard unit: %
High values may indicate
Elevated Hb A1a may occur in the context of abnormal hemoglobin variants.
Low values may indicate
Normal levels.
Frequently asked questions
- What is a normal Hemoglobin A1a level?
- A typical reference range for Hemoglobin A1a is 0–2 % (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Hemoglobin A1a measured in?
- Hemoglobin A1a is most commonly reported in %. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Hemoglobin A1a reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Hemoglobin A1a over time?
- Yes. Upload results from any lab and BloodId charts your Hemoglobin A1a over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: BloodId admin-reviewed
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