Glycosylated Hemoglobin A2 (HbA2) by Electrophoresis
This test measures a specific form of hemoglobin (HbA2) that carries sugar molecules, reflecting long-term blood sugar levels. It helps assess conditions like diabetes or genetic blood disorders.
["This test helps track blood sugar control over time and check for inherited blood disorders."]
Key facts at a glance
- LOINC
- 4554-2
- Short code
- Hgb A2 MFr Bld Elph Alk
- Synonyms
- Hgb A2 MFr Bld Elph Alk
- Category
- hematology
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Ref low
- 3.5
- Ref high
- 5
- Critical range
- 7 N/A – 20 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- electrophoresis-ph
- CPT
- 84132
- SNOMED
- 110742001
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters for Blood Sugar Control
HbA2 is a form of hemoglobin that binds glucose over months, unlike regular blood sugar tests that measure immediate levels. It’s particularly useful for people with diabetes to monitor long-term management, as it reflects average blood sugar trends over time. This test can also help diagnose conditions like thalassemia or other hemoglobinopathies.
How the Test Works
Your blood sample is separated using electrophoresis, a method that sorts proteins based on size and electrical charge. HbA2, along with other hemoglobin types, is identified and measured. This process helps distinguish HbA2 from other hemoglobin variants.
What to Expect Before the Test
No special preparation is needed for this test. You may have a small needle inserted to draw blood from a vein in your arm. If you’re concerned about needles or have a history of blood draws, let your healthcare provider know.
Common Conditions This Test Helps Diagnose
HbA2 testing is critical for diagnosing and managing diabetes, particularly in children and adults who may not have classic symptoms. It can also help identify genetic blood disorders like thalassemia, where hemoglobin production is abnormal.
Reference range
Adult: 3.5-5.0 mmol/LN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated HbA2 levels may indicate conditions like thalassemia or other hemoglobinopathies. In diabetes, HbA2 levels can help determine if blood sugar control is adequate, guiding treatment adjustments. Regular monitoring with HbA2 can reduce risks of long-term diabetes complications.
Short name
HbA2 Electrophoresis
Frequently asked questions
What does an abnormal HbA2 result mean?
How often should I get this test?
Can lifestyle changes affect HbA2 levels?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy