Specialty Testing Guide › GI-MAP Gut Testing
An H. pylori result on a GI-MAP means the lab found DNA from Helicobacter pylori, a stomach bacterium, in your stool. If the amount is above the lab's cutoff, the report adds genes linked to how aggressive the strain may be and genes linked to antibiotic resistance. That is useful information, but it is not where the decision ends.
A positive result should lead to the same path any H. pylori infection follows under current guidelines: confirm it is active if there is doubt, treat it with an evidence-based regimen, and check afterward that it is gone. Herbs alone and watchful waiting are not the guideline approach.
Key takeaways
- The GI-MAP reports H. pylori DNA plus virulence and resistance genes, which can add detail to a positive result.
- The American College of Gastroenterology advises that anyone confirmed to have active infection be offered effective treatment, then a test of cure.
- Breath, stool antigen and biopsy tests remain the standard ways to confirm active infection and check that treatment worked.
- Resistance gene results may help choose antibiotics, but they do not replace a clinician's prescription or the follow-up test.
What H. pylori is and why it matters
H. pylori lives in the stomach lining. Many people carry it for years without symptoms, but it can cause gastritis, peptic ulcers and, over a long time, stomach cancer. The 2024 ACG guideline notes that most infected people remain without symptoms or meaningful consequences, while many others develop benign or serious disease.1
Because the outcome cannot be predicted for an individual, guidelines treat a confirmed infection as something to clear rather than monitor. Our article on H. pylori symptoms and risks covers who should be tested in the first place.
What the GI-MAP reports for H. pylori
- The H. pylori level. An amount of bacterial DNA per gram of stool, compared with the lab's own reference cutoff.
- Virulence factor genes. The panel checks for babA, cagA, dupA, iceA, oipA, vacA, virB and virD, genes the lab links to more serious infection.23
- Antibiotic resistance genes. Gene changes associated with resistance to clarithromycin, amoxicillin, fluoroquinolones and tetracycline.
The lab's interpretive guide states that the H. pylori resistance genes are reported only when the H. pylori result is 5.0e2 or greater.3 A low or undetectable level therefore comes without resistance information.
How the GI-MAP compares with standard H. pylori tests
| Test | What it detects | Where it fits |
|---|---|---|
| GI-MAP (stool qPCR) | H. pylori DNA, plus virulence and resistance genes | Can raise or support suspicion; not the guideline test of cure |
| Urea breath test | Active infection, through a breath sample after a test drink | Standard for diagnosis and test of cure |
| Stool antigen test | H. pylori proteins in stool, reflecting active infection | Standard for diagnosis and test of cure |
| Biopsy during endoscopy | Infection and damage in stomach tissue; culture or molecular testing for resistance | When endoscopy is needed anyway, such as with alarm symptoms |
The ACG guideline names the urea breath test, the stool antigen test and biopsy-based tests for confirming cure at least 4 weeks after treatment.1 Acid-reducing medicines matter here: the guideline advises stopping proton pump inhibitors for 2 weeks before a breath or stool antigen test, because they can cause false negatives.1 Do not stop a prescribed medicine without talking to the clinician who prescribed it.
Because a DNA test cannot tell live bacteria from leftover genetic material, it is reasonable to ask your clinician whether to confirm a GI-MAP positive with one of the standard tests, especially when the level is low.
Why treatment follows the guideline
The lab's interpretive guide states that patients without symptoms may not require treatment and lists herbal formulas among options.3 The ACG takes a different position: all patients with an indication for testing should be offered effective treatment if confirmed to have active infection, followed by a test of cure.1
For people whose antibiotic susceptibility is unknown, the ACG prefers 14 days of bismuth quadruple therapy as the first treatment.1 That is a prescription regimen chosen by a clinician, and this article does not give doses.
The guideline also recommends testing adult household members of anyone found positive by a test other than blood antibodies.1 If a partner or adult family member has stomach symptoms, mention your result to them.
What virulence and resistance genes add
Virulence genes describe the strain's potential to cause harm. They can help a clinician explain risk, but under the ACG approach a confirmed active infection is offered treatment whether or not these genes are present.
Resistance genes are more directly useful. The ACG guideline describes molecular susceptibility testing as increasingly available but says the benefit of tailoring treatment to it, over standard empiric choices, remains to be adequately defined.1 The ACG advises using susceptibility testing whenever the choice of therapy remains unclear, such as after earlier failed treatment.
What to do with a positive result
- Seek prompt care if you have vomiting, black or bloody stools, unexplained iron deficiency or weight loss. Those are usually reasons for prompt endoscopy, not a stool panel follow-up.
- Otherwise, discuss confirmation and treatment with your clinician. In Pennsylvania, a primary care doctor or gastroenterologist can order a breath or stool antigen test.
- Plan the test of cure at least 4 weeks after finishing treatment.
Whether YoungerMeMD manages H. pylori treatment directly or refers you is something to ask our team. For how a results visit works, read after your GI-MAP results, and see the GI-MAP hub for the full set of articles.
Frequently asked questions
My GI-MAP shows H. pylori but I feel fine. Do I need treatment?
Under the ACG guideline, a confirmed active infection should be offered treatment even without symptoms, because it can lead to ulcers or stomach cancer over time. Confirming that the infection is active is a reasonable first step.
Can I use a GI-MAP to check that treatment worked?
The guideline tests of cure are the urea breath test, the stool antigen test or a biopsy-based test, done at least 4 weeks after treatment. Ask your clinician which one to use.
Do positive virulence genes mean I will get stomach cancer?
No. They describe a strain's potential, not your outcome. Most people with H. pylori never develop cancer, and studies link eradication to a lower risk.
Related reading
This article is for general education and is not medical advice. Decisions about testing and treatment should be made with your clinician. If you have severe symptoms, call 911. For a suspected poisoning, call Poison Control at 1-800-222-1222.
