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Hemoglobin A1c (HbA1c) with Immunoassay Probe

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 how well your diabetes is managed over time."]

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

Key facts at a glance

LOINC
105813-0
Short code
MRB mecC Ct Bld Pos Qn NAA+probe
Synonyms
MRB mecC Ct Bld Pos Qn NAA+probe
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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

What Is HbA1c Used For?

HbA1c is primarily used to diagnose diabetes, monitor long-term blood sugar levels, and adjust treatment plans if needed. It’s a key indicator of whether your current diabetes management strategies are effective.

How Is This Test Performed?

A small blood sample is taken from your arm, usually during a routine doctor’s visit or lab visit. The sample is analyzed using an immunoassay method to detect hemoglobin A1c levels.

Why Is This Test Important?

Unlike daily blood sugar checks, HbA1c gives a broader picture of your average blood sugar levels, helping prevent complications like nerve damage, kidney disease, or heart problems over time.

What Does a High or Low HbA1c Mean?

A high HbA1c (typically above 7%) suggests poor blood sugar control, while a low HbA1c (below 6%) may indicate consistently well-controlled levels—but always discuss results with your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

HbA1c is clinically significant because it provides a reliable, objective measure of glycemic control that isn’t affected by short-term fluctuations in blood sugar. It’s especially useful for patients with diabetes or prediabetes to track progress and adjust treatment, such as medication or diet.

Short name

HbA1c

Frequently asked questions

How often should I get an HbA1c test?
Typically, adults with diabetes get an HbA1c test every 3–6 months, while others may need it less frequently unless advised otherwise by their healthcare provider.
What factors can affect my HbA1c results?
Factors like recent blood loss, certain medications (e.g., iron supplements), or iron deficiency can temporarily affect HbA1c levels. Always share your full medical history with your doctor.
Can I do anything to improve my HbA1c before the test?
No special preparation is needed, but avoid smoking or drinking alcohol 24 hours before the test. Eating a normal meal the day of the test is fine.
  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