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Hemoglobin A1c (HbA1c) with Electrophoresis-Based Separation

Published: August 9, 2026Updated: August 16, 2026

This test measures the percentage of hemoglobin A1c in your blood, which reflects your average blood sugar levels over the past 2–3 months. It helps doctors assess long-term diabetes control.

Quick summary

["HbA1c provides a snapshot of how well your blood sugar has been managed over time."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
22321-4
Short code
HBV e Ab Ser-aCnc
Synonyms
HBV e Ab Ser-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

What HbA1c Measures

HbA1c is a form of hemoglobin (the protein in red blood cells that carries oxygen) that has been attached to sugar (glucose) from your blood. The test quantifies this attachment to gauge your average blood sugar levels over time, accounting for factors like diet, activity, and illness.

Why It’s Done

Doctors order HbA1c tests to diagnose diabetes, monitor treatment progress, or detect prediabetes. It’s particularly useful because blood sugar levels fluctuate daily, but HbA1c gives a more stable picture of long-term health.

How It Works

Your blood sample is analyzed using electrophoresis, a technique that separates hemoglobin variants based on their electrical charge. The test identifies the proportion of HbA1c among all hemoglobin types.

What to Expect

A healthcare provider will draw blood from your arm. The process is quick and typically painless. You may feel slight discomfort, but it’s usually over in minutes. No special preparation is needed unless instructed otherwise.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HbA1c Electrophoresis

Frequently asked questions

How often should I get this test?
Typically, people with diabetes check their HbA1c every 3–6 months to track progress. Your doctor may adjust frequency based on your treatment plan or blood sugar trends.
Can lifestyle changes affect HbA1c results?
Yes! Improving diet, exercise, and managing stress can lower HbA1c levels over time. Small, consistent changes often have the biggest impact.
What does an abnormal HbA1c mean?
An HbA1c below 5.7% may indicate prediabetes, while 6.5% or higher suggests diabetes. Results should always be interpreted by your doctor, as they consider your overall health and symptoms.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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