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Helicobacter pylori IgA Antibody (Serum/Plasma)

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

This test checks for antibodies to *Helicobacter pylori*, a bacteria often linked to stomach issues like ulcers or inflammation. It helps determine if you’ve been exposed to the bacteria, even if symptoms aren’t present.

Quick summary

["This test helps identify past or current infection by *Helicobacter pylori*, which may affect digestion or increase risk for stomach problems."]

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

Key facts at a glance

LOINC
6420-4
Short code
H pylori IgA Ser IA-aCnc
Synonyms
H pylori IgA Ser IA-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
ia
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

Why This Test Matters

Helicobacter pylori is a common bacteria that can live in the stomach. If left untreated, it may cause irritation, inflammation, or ulcers. This test helps doctors decide if treatment is needed, even if you don’t have symptoms.

What to Expect Before the Test

No special preparation is needed. A blood sample is taken from your arm, similar to a regular blood draw. If you’re tested for *H. pylori* via stool or breath, follow any specific instructions your doctor gives.

How the Test Works

The test detects IgA antibodies in your blood. These antibodies are your immune system’s response to *Helicobacter pylori*. If present, it suggests you’ve been exposed to the bacteria at some point.

What the Results Mean

A positive result means you likely had *Helicobacter pylori* in the past or currently. A negative result suggests no recent exposure. Results don’t always show active infection—your doctor may order additional tests for clarity.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgA Antibody Test for H. pylori

Frequently asked questions

Does a positive result mean I have stomach problems?
Not necessarily. Many people with *Helicobacter pylori* have no symptoms. However, untreated infection can increase risk for stomach ulcers, inflammation, or other issues. Your doctor will discuss next steps based on your results and symptoms.
Can this test be used to confirm an active infection?
Sometimes. While antibodies indicate past or possible current exposure, other tests (like breath tests or stool samples) may be needed to confirm active infection. Your doctor will guide you on the best approach.
What if my results are positive but I don’t have symptoms?
You may still need treatment to clear the bacteria, even without symptoms. Untreated infection can cause long-term stomach issues. Follow-up testing and treatment plans will be tailored by your healthcare provider.
  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