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Endoscopic detection of Helicobacter pylori infection via urea breath test (qualitative)

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

This test checks if you have the bacteria *Helicobacter pylori*, which can cause stomach issues like ulcers or inflammation. It uses a special breath sample after drinking a liquid containing urea.

Quick summary

["A simple breath test to detect stomach bacteria linked to digestive problems."]

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

Key facts at a glance

LOINC
112055-9
Short code
Endosc find Mnr ppl Endscpy
Synonyms
Endosc find Mnr ppl Endscpy
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
endoscopy
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

How the Test Works

You’ll drink a liquid containing urea, which bacteria *Helicobacter pylori* (if present) will convert into carbon dioxide and nitrogen. You’ll then blow into a special bag to collect your breath. A small sample of this breath is analyzed to detect the presence of these gases.

Why It’s Done

Your doctor may recommend this test if you have symptoms like stomach pain, heartburn, nausea, or unexplained weight loss. It’s also used to confirm infection after treatment or before certain stomach procedures.

Preparation

No special preparation is needed, but avoid taking antibiotics or proton pump inhibitors (like Prilosec) for at least two weeks before testing, as they can affect results.

What to Expect

The test takes about 30 minutes. You’ll sit quietly while drinking the liquid and then blow into the bag. No needles or injections are involved. Results are usually ready within a few days.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

H. pylori breath test (qualitative)

Frequently asked questions

Helicobacter pylori infection can lead to chronic inflammation, ulcers, or even stomach cancer if untreated. Early detection helps guide treatment, such as antibiotics or lifestyle changes to reduce stomach acid.
This test is quick, non-invasive, and avoids blood draws or biopsies, making it a preferred choice for many patients.
What does a positive result mean?
A positive result means *Helicobacter pylori* is likely present in your stomach. Your doctor will work with you to develop a treatment plan, often including antibiotics and lifestyle adjustments.
Can I eat or drink anything before the test?
Yes, you can eat and drink normally before the test, but avoid alcohol or carbonated drinks for at least 2 hours before testing, as they may affect the breath sample.
  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