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Serum or Plasma *Hemoglobin A1c* (HbA1c) with Immunoassay Confirmation

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

This test measures the average level of hemoglobin A1c in your blood over the past 2–3 months, reflecting your blood sugar control during that time.

Quick summary

["HbA1c helps doctors assess long-term diabetes management and adjust treatment plans."]

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

Key facts at a glance

LOINC
5182-1
Short code
HAV IgM Ser RIA-aCnc
Synonyms
HAV IgM Ser RIA-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ria
CPT
82784
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 Does This Test Measure?

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. It reflects your average blood sugar levels over time, giving a snapshot of how well your diabetes or prediabetes is controlled. Unlike daily blood sugar checks, HbA1c provides a broader picture of your glucose management.

Why Is This Test Important?

HbA1c is crucial for people with diabetes or those at risk because it helps prevent complications like nerve damage, kidney disease, or vision problems. Regular monitoring ensures your treatment stays effective and helps avoid long-term health risks.

How Is the Test Performed?

A small blood sample is taken from your arm, usually by a healthcare professional. The sample is sent to a lab where it’s analyzed using an immunoassay method to detect and confirm the HbA1c level.

What Are Common Results?

Results are typically reported as a percentage (e.g., 6.5%). While exact ranges vary by lab, higher percentages indicate poorer blood sugar control, while lower percentages suggest better management.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

HbA1c is a key indicator of diabetes management. A level above 6.5% often confirms diabetes, while levels between 5.7% and 6.4% may indicate prediabetes. Regular monitoring helps doctors adjust medications, lifestyle changes, or other treatments to improve health outcomes.

Short name

HbA1c (Confirm)

Frequently asked questions

How often should I get this test?
For people with diabetes, HbA1c tests are usually recommended every 3–6 months to track progress and make necessary adjustments to your treatment plan.
What factors can affect my HbA1c results?
Several factors, such as recent blood loss, pregnancy, or certain medications, can temporarily affect HbA1c levels. Always discuss any recent changes with your healthcare provider.
Can lifestyle changes impact my HbA1c?
Yes! Diet, exercise, and managing stress can improve blood sugar control, potentially lowering your HbA1c over time. Work with your doctor to create a personalized plan.
  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