Skip to content

Hemoglobin A1c (HbA1c) measured by high-performance liquid chromatography (HPLC)

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

This test measures the average blood sugar levels over the past 2 to 3 months, helping doctors assess long-term blood glucose control.

Quick summary

["HbA1c reflects your blood sugar management over time, aiding diabetes care."]

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

Key facts at a glance

LOINC
9984-6
Short code
QRS T-Amp L-V6
Synonyms
QRS T-Amp L-V6
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ekg
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 Is HbA1c Used For?

HbA1c is primarily used to diagnose diabetes, monitor treatment progress, and check if your blood sugar is consistently within target ranges. It’s a key indicator of how well your body manages glucose over time, especially useful for people with type 1 or type 2 diabetes.

How Is HbA1c Different from Daily Blood Sugar Checks?

Unlike daily blood sugar tests (like fingerstick glucose checks), HbA1c gives a broader picture by measuring the percentage of hemoglobin coated with sugar. This reflects your average blood sugar levels over months, not just recent spikes or drops.

Why Is HbA1c Important for Diabetes Management?

Regular HbA1c testing helps prevent complications like nerve damage, kidney disease, or heart problems by ensuring your blood sugar stays within safe limits. It’s a non-invasive way to track progress without frequent blood draws.

How Often Should HbA1c Be Checked?

For most people with diabetes, HbA1c is checked every 3 to 6 months. Your doctor may adjust frequency based on your treatment plan, blood sugar goals, or how well your test results align with your symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: HbA1c and Diabetes Risk

Short name

HbA1c

Frequently asked questions

How does HbA1c help doctors determine if my blood sugar is well-controlled?
HbA1c provides a long-term snapshot of your blood sugar levels. A result below 7% (varies by doctor) typically indicates good control, while higher levels may signal the need for adjustments to diet, medication, or lifestyle.
Can HbA1c be affected by factors other than diabetes?
Yes, conditions like anemia, kidney disease, or certain medications (e.g., blood thinners) can influence HbA1c results. Your doctor may order additional tests to rule out these factors if needed.
What does an abnormal HbA1c result mean for my health?
An elevated HbA1c suggests poor blood sugar control, increasing risks for diabetes-related complications. A low result may indicate excellent management, but it’s not a substitute for daily monitoring or lifestyle changes.
  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