Hemoglobin A1c (HbA1c) by High-Performance Liquid Chromatography (HPLC)
This test measures the percentage of hemoglobin in your blood that is attached to sugar (glucose). It reflects your average blood sugar levels over the past 2–3 months.
["HbA1c helps doctors track long-term diabetes control and adjust treatment plans."]
Key facts at a glance
- LOINC
- 50603-0
- Short code
- HPA-6 Bld
- Synonyms
- HPA-6 Bld
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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 Diabetes Management
HbA1c is a key tool for managing diabetes because it provides a snapshot of how well your blood sugar has been controlled over time. Unlike daily blood sugar checks, which can be affected by short-term fluctuations, HbA1c gives a more stable picture of your average glucose levels.
How the Test Works
Your blood sample is analyzed using high-performance liquid chromatography (HPLC), a precise method that separates and measures different types of hemoglobin. The test focuses on the portion of hemoglobin that has been linked to glucose, indicating your long-term blood sugar trends.
What to Expect Before the Test
No special preparation is needed for this test. It’s typically drawn from a simple blood sample, often taken from your arm. If you’re on blood thinners, let your doctor know before the test.
What the Results Mean
Results are reported as a percentage (e.g., 5.7%, 6.4%, 7.5%). While exact ranges vary by lab, higher percentages generally indicate poorer blood sugar control. Your doctor will interpret the result in the context of your health and treatment goals.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
HbA1c
Frequently asked questions
HbA1c is essential for diagnosing diabetes (e.g., prediabetes or type 1/2 diabetes) and assessing how well your diabetes is managed. Regular monitoring helps prevent complications like nerve damage, kidney disease, or heart problems by identifying trends early.
For most people with diabetes, HbA1c tests are recommended every 3–6 months. Your doctor may adjust this frequency based on your blood sugar goals, overall health, and how well your treatment is working.
A higher HbA1c may signal poor blood sugar control. Your doctor might review your diet, exercise, medications, or stress levels to find ways to improve it. Small, gradual changes—like adjusting insulin doses or meal timing—can help lower it over time.
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