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Hemoglobin A1c (HbA1c) by Electrophoresis

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

This test measures the percentage of hemoglobin that is glycated (attached to sugar) over the past 2–3 months, reflecting your average blood sugar levels during that time.

Quick summary

["Helps doctors assess long-term blood sugar control for diabetes management."]

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

Key facts at a glance

LOINC
51196-4
Short code
Hgb A1 MFr Bld Elph
Synonyms
Hgb A1 MFr Bld Elph
Category
hematology
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
12
Ref high
17.5
Critical range
7 N/A – 20 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
electrophoresis
CPT
85018
SNOMED
900000000000003004
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 Management

HbA1c is a key indicator of how well your blood sugar has been controlled over time. Unlike daily blood sugar checks, it provides a broader picture of your average glucose levels, helping prevent complications like nerve damage or kidney disease.

How the Test Works

Your blood sample is separated using electrophoresis, a method that sorts hemoglobin types based on their electrical charge. The test identifies the proportion of glycated hemoglobin (HbA1c) among all hemoglobin types.

What Normal Results Mean

A result in the normal range typically suggests good blood sugar control, though individual reference ranges may vary by lab. Results outside this range may indicate higher or lower than average blood sugar levels over time.

Clinical Significance

HbA1c is used to diagnose diabetes (if consistently above 6.5%) and monitor treatment effectiveness. It’s particularly useful for people with type 1 or type 2 diabetes, as it reflects long-term glucose exposure that daily tests can’t capture.

Reference range

Adult males: 13.5-17.5 g/dL; Females: 12.0-16.0 g/dLN/A

Specimen: whole-blood

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.

◆Associated findings1

Short name

HbA1c (Serum/Plasma)

Frequently asked questions

What does an HbA1c test tell me about my diabetes?
It shows your average blood sugar levels over the past 2–3 months, helping doctors determine if your diabetes is well-controlled or if adjustments to treatment are needed.
Can I get an HbA1c test without having diabetes?
Yes, it’s often used in screenings for prediabetes or as part of routine health checks, especially for people at higher risk (e.g., overweight, family history).
How often should I get an HbA1c test?
Typically every 3–6 months if you have diabetes, or as recommended by your healthcare provider for prediabetes or other risk factors.
  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