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Helicobacter pylori IgA Antibody, Serum

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

This test checks for antibodies to *Helicobacter pylori*, a bacteria linked to stomach issues like ulcers or inflammation. Antibodies indicate past or current infection.

Quick summary

["Tests for *H. pylori* antibodies to help diagnose stomach infections."]

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

Key facts at a glance

LOINC
40820-3
Short code
H pylori IgA Titr Ser
Synonyms
H pylori IgA Titr Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Might Be Ordered

Your doctor may recommend this test if you have symptoms like stomach pain, nausea, or unexplained weight loss. It’s also used to confirm an *H. pylori* infection after treatment or if you’re at higher risk (e.g., frequent ulcers, family history).

What to Expect Before the Test

No special preparation is needed. A blood sample is taken from a vein in your arm. You may feel slight discomfort, but it’s quick and usually painless.

What the Results Mean

Positive results suggest past or current *H. pylori* infection. Negative results mean no detectable antibodies, but infection could still be present without antibodies. Follow-up testing may be needed.

Common Causes of False Results

Antibody tests may not detect recent infections or chronic cases without active inflammation. If your doctor suspects ongoing infection, they may order additional tests (e.g., breath test, stool antigen).

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgA Antibody to *H. pylori* (Serum)

Frequently asked questions

Helicobacter pylori infection can cause chronic gastritis, ulcers, or even stomach cancer if untreated. Early diagnosis helps guide treatment (e.g., antibiotics, acid reducers) to prevent complications.
This test alone doesn’t confirm infection—it only shows if your body has made antibodies. If you test positive, your doctor may recommend further testing to confirm active infection.
Can I eat or drink before the test?
No restrictions apply. You can eat and drink normally, but avoid alcohol for 24 hours if possible, as it may affect antibody levels.
How long will I get my results?
Results are typically available within 3–5 business days. Your doctor will discuss them with you during your follow-up visit.
  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