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Hemoglobin A1c (HbA1c) with Immunoassay Method, 24-Hour Fluid Specimen

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

This test measures the average blood sugar levels over the past 2–3 months by analyzing hemoglobin bound to glucose in your red blood cells.

Quick summary

["Helps track 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
95544-3
Short code
HTLV I DNA # Spec NAA+probe
Synonyms
HTLV I DNA # Spec NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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 This Test Measures

HbA1c reflects your blood sugar levels over time, as it’s a stable form of hemoglobin that carries red blood cells. The test detects the percentage of hemoglobin molecules that have glucose attached, indicating how consistently your blood sugar has been managed.

Why It’s Done

Doctors use HbA1c to diagnose diabetes, monitor treatment progress, and assess long-term blood sugar control in people with or without diabetes.

How It’s Performed

A small blood sample is taken from your arm, typically during a routine visit. The sample is processed to measure the proportion of hemoglobin bound to glucose using an immunoassay method.

What to Expect Before or After

No special preparation is needed, but inform your doctor if you’re taking certain medications or have a bleeding disorder. Results may take a few days to return.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

HbA1c (Immunoassay)

Frequently asked questions

HbA1c is a key indicator of diabetes management, helping prevent complications like nerve damage, kidney disease, or heart disease by showing whether your blood sugar is consistently within target ranges.
An HbA1c result of 6.5% or higher on two separate tests typically confirms diabetes diagnosis. Lower results suggest better control, while higher results may indicate poor management or undiagnosed diabetes.
How often should I get this test?
For people with diabetes, HbA1c testing is usually recommended every 3–6 months to track progress. Your doctor may adjust frequency based on your treatment plan and blood sugar trends.
What do my results mean?
Results below 5.7% are generally considered normal, while 5.7%–6.4% may indicate prediabetes. Results at or above 6.5% suggest diabetes. Your doctor will interpret results in the context of your overall health.
  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