Hemoglobin A1c (HbA1c) by High-Performance Liquid Chromatography (HPLC) with Electrophoresis
This test measures the average blood sugar levels over the past 2–3 months by detecting the percentage of hemoglobin (red blood cell protein) that has been linked to glucose.
["HbA1c helps doctors track long-term blood sugar management in people with diabetes or prediabetes."]
Key facts at a glance
- LOINC
- 82389-8
- Short code
- HMGCR Ab Ser Ql Line blot
- Synonyms
- HMGCR Ab Ser Ql Line blot
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- line-blot
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters
Unlike daily blood sugar checks, HbA1c gives a broader picture of how well your body manages glucose over time. It’s a key tool for adjusting diabetes treatments and preventing complications like nerve damage or kidney issues.
How the Test Works
A small blood sample is analyzed using high-performance liquid chromatography (HPLC) to separate hemoglobin variants. The test identifies the proportion of hemoglobin bound to glucose, which reflects your average blood sugar levels.
What to Expect Before the Test
No special preparation is needed. A healthcare provider will draw blood from your arm, similar to a routine blood test. You may feel slight discomfort, but it’s usually over quickly.
What the Results Mean
Results are expressed as a percentage (e.g., 6.5%). Higher percentages indicate poorer long-term blood sugar control. While exact ranges vary by lab, values above 7% may signal uncontrolled diabetes, while values below 6% may suggest good control.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
HbA1c is critical for diagnosing diabetes (typically ≥6.5%), monitoring treatment effectiveness, and identifying trends in blood sugar management. It’s also used to assess risk for diabetes-related complications and guide lifestyle or medication adjustments.
Short name
HbA1c (Blood Sugar Control Test)
Frequently asked questions
How often should I get this test?
What factors could affect my HbA1c results?
Can I fast before this test?
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