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Hemoglobin A1c (HbA1c) with Fluorescence Immunoassay (FIA) in Whole Blood

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

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

Quick summary

["HbA1c tracks your blood sugar trends to guide treatment and prevent complications."]

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

Key facts at a glance

LOINC
85778-9
Short code
Haem influ DNA Bld Pos Ql NAA+n-prb
Synonyms
Haem influ DNA Bld Pos Ql NAA+n-prb
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
non-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 HbA1c Measures

HbA1c reflects the percentage of hemoglobin molecules that have sugar (glucose) attached. It’s a key indicator of how well your blood sugar has been managed over time, since red blood cells live for about 3 months.

How It’s Used in Care

Doctors use HbA1c to diagnose diabetes, monitor treatment effectiveness, and adjust medications like insulin or oral diabetes drugs. It’s a standard test for people with type 1 or type 2 diabetes.

How the Test Works

This test uses a fluorescence-based method to detect sugar-bound hemoglobin in whole blood. Unlike traditional methods that use serum, this approach is quick and can be done directly from a fingerstick sample.

Preparation and Sample Collection

No special preparation is needed. A healthcare provider will take a small blood sample from your finger. The test is typically done during a routine doctor’s visit or lab visit.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

HbA1c is critical for identifying diabetes risk (e.g., prediabetes or undiagnosed diabetes) and evaluating long-term blood sugar control. Values above 6.5% often confirm diabetes, while lower values suggest better management. It’s particularly useful for people with diabetes to track progress and prevent complications like nerve damage or kidney disease.

Short name

HbA1c (FIA)

Frequently asked questions

Why might my HbA1c test be done?
Your doctor may order this test if you have symptoms of high blood sugar (e.g., frequent urination, excessive thirst), a family history of diabetes, or if you’re at risk due to weight, age, or other health conditions. It’s also part of routine check-ups for people with diabetes.
How often should I get this test?
For people without diabetes, HbA1c is usually checked once a year. If you have diabetes, your doctor may recommend testing every 2–3 months or more frequently to adjust your treatment plan.
What do my HbA1c results mean?
Results are interpreted as a percentage. A result below 5.7% is generally considered normal, 5.7%–6.4% suggests prediabetes, and 6.5% or higher indicates diabetes. Your doctor will discuss these results in detail with you.
  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