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Immunoglobulin G (IgG) anti-flagellin antibody, serum/plasma

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

This test measures your body’s immune response to flagellin, a protein found in certain bacteria. It helps assess exposure to organisms like *Campylobacter* or *Helicobacter pylori*, which may cause infections.

Quick summary

["This test helps identify past or ongoing immune reactions to specific bacterial proteins."]

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

Key facts at a glance

LOINC
42788-0
Short code
IGF-IR Ag Tiss Ql ImStn
Synonyms
IGF-IR Ag Tiss Ql ImStn
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
immune-stain
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?

IgG antibodies are part of your immune system’s long-term defense. This test detects IgG antibodies against flagellin, a protein that some bacteria use to move. Elevated levels may suggest exposure to flagellin-producing bacteria, though they don’t always indicate an active infection.

Why Might You Need This Test?

Your healthcare provider may order this test if you’ve been exposed to bacteria like *Campylobacter* (a common cause of foodborne illness) or if you have symptoms like stomach pain, diarrhea, or fever that could relate to bacterial infection.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (either serum or plasma) via a simple venipuncture. The test is typically done in a lab and results are available within a few days.

What the Results Mean

Results are qualitative (positive or negative) and indicate whether your immune system has produced IgG antibodies against flagellin. A positive result suggests past exposure, but it doesn’t confirm an active infection without clinical correlation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgG Anti-Flagellin Antibody

Frequently asked questions

How long will it take to get my results?
Results are usually available within 2–5 business days, depending on lab processing times. Your provider will discuss them with you during your follow-up visit.
Can I have this test if I’m pregnant?
Yes, this test is generally safe during pregnancy. However, always confirm with your healthcare provider before any blood tests.
Does this test show if I have an active infection?
No, this test only shows if your body has produced IgG antibodies against flagellin in the past. An active infection would require additional tests, such as culture or other diagnostic methods.
  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