H. pylori, short for Helicobacter pylori, is a bacterium that infects the stomach lining. Many people have no symptoms. In others, it contributes to inflammation or ulcers. Symptoms alone cannot establish whether you have it; testing is part of a medical assessment. MedlinePlus
If you are concerned about H. pylori, there are three useful questions: Is testing appropriate? Which test answers the question? Who will manage the result?
What symptoms can occur?
Possible symptoms include upper-abdominal discomfort or burning, nausea, bloating and reduced appetite. These symptoms have many possible explanations, so a symptom checklist cannot diagnose an infection. Some people with H. pylori have no symptoms at all. Mayo Clinic
A symptom diary can help an appointment: record where the discomfort occurs, when it began, whether eating changes it and which medicines you use. Include over-the-counter products. Tell your clinician about any previous test or antibiotic course rather than assuming it is unrelated.
When should I seek care promptly?
Seek immediate medical help for vomiting blood or material resembling coffee grounds, black tarry stools, fainting, or sudden severe abdominal pain that does not settle. Persistent vomiting, difficulty swallowing and unexplained weight loss also need prompt assessment. A home test should not delay care. MedlinePlus warning signs, Mayo Clinic symptoms
Who should discuss testing?
The decision depends on symptoms, age and medical history. Examples in current US guidance include certain adults with ongoing indigestion, people with current or previous peptic ulcers, and people with particular stomach cancer risk factors or premalignant stomach findings. Adult household members of someone with H. pylori are also included in the guidance. Some presentations require endoscopy rather than a simple test-and-treat approach. ACG 2024 highlights
This guide concerns adults. Children's testing decisions belong with their pediatric clinician; an adult household recommendation should not be applied automatically to a child.
How does H. pylori spread?
Transmission is thought to involve contact with infected saliva, vomit or stool, and potentially contaminated food or water. Infection is often acquired during childhood. It is usually not possible to work out exactly when or from whom an individual acquired it. NCI
A positive result is not evidence that a partner was unfaithful or that someone has recently done something wrong. Ask your clinician whether household members should discuss testing. Basic hand hygiene and safe food and water practices remain sensible; buying tests for an entire household without considering age and clinical context is not a substitute for that conversation.
Which tests are used?
| Test | What it measures | Main distinction |
|---|---|---|
| Laboratory stool antigen | Proteins associated with H. pylori | An established non-invasive option for current infection |
| Urea breath test | A change in a swallowed test substance caused by bacterial enzyme activity | An established alternative that uses breath samples |
| Stool PCR | Targeted bacterial DNA; some assays also examine resistance markers | Evidence and reporting depend on the named assay |
| Blood antibody | The immune system's response | Can remain positive after infection clears |
| Endoscopy with biopsy tests | Stomach tissue and/or organisms from it | Can address other clinical questions when endoscopy is needed |
These tests are not interchangeable merely because they concern the same bacterium. A clinician should select the test for the intended use, including any follow-up after treatment. Mayo Clinic testing overview, MedlinePlus
For a closer look at the alternatives, read our H. pylori test comparison.
Where does GI-MAP fit?
GI-MAP is a named laboratory assay from Diagnostic Solutions Laboratory. Its H. pylori component uses quantitative PCR and reports selected virulence and resistance-associated markers. It is different from a stool antigen test and from a rapid test read at home. Manufacturer methodology
The broader panel already includes H. pylori. More markers do not automatically make a panel the best first choice for a focused H. pylori question. A standard clinician-arranged stool antigen or breath test may be sufficient. If you and your clinician are considering this particular molecular assay, review the sample report and H. pylori biomarker explanation before choosing a package.
What happens after a positive result?
Take the result to a clinician who can assess and prescribe. A confirmed infection needs a treatment discussion even if symptoms are mild or absent. Treatment usually combines medicines rather than relying on one antibiotic or a supplement. Follow-up testing establishes whether the infection has cleared; improvement in symptoms alone cannot do that. ACG 2024 highlights
Do not choose antibiotics from a report's gene list or repeat an old prescription yourself. Tell the prescriber about allergies, medicines and previous antibiotic exposure. Arrange the follow-up plan while discussing treatment so it is not forgotten later.
Our treatment and retesting guide provides a worksheet for that conversation.
What does a negative result mean?
A negative result generally makes infection less likely, but interpretation depends on the method and the conditions under which testing occurred. Medicines, timing and sample issues can affect some tests. If symptoms continue or results disagree, ask your clinician to review the actual reports and preparation history. Do not assume that the most expensive or most detailed report must be correct. Mayo Clinic Laboratories diagnostic pathway
If two reports disagree, use the negative and conflicting results guide to prepare a testing timeline.
Does H. pylori mean I have cancer?
No. Infection can increase the risk of certain stomach cancers over time, but an infection test does not diagnose cancer. A virulence-gene result is not a personal cancer forecast. Discuss family history and previous stomach findings with your clinician. NCI risk factors
Next step: prepare a list of symptoms, medicines and previous results for your healthcare appointment. You do not need to start by purchasing the largest panel.
Sources: MedlinePlus; Mayo Clinic; ACG 2024 and patient information; NCI; Mayo Clinic Laboratories; Diagnostic Solutions Laboratory (manufacturer specifications only). Inline links identify the sources.
For a correction or source question, contact Gi Map Test.