Helicobacter pylori can be tested for in three ways without a gastroscopy: the urea breath test (the most convenient, more than 90% accurate), the stool antigen test (just as accurate, easier with children) and blood antibodies (only for initial diagnosis). Critically, omeprazole and other PPIs are stopped 2 weeks before any test — otherwise you get a false negative result.
Why look for H. pylori
Helicobacter pylori lives in the stomach lining of half the population and causes chronic gastritis, stomach and duodenal ulcers, and after decades of carriage raises the risk of stomach cancer. The bacterium spreads through everyday contact — shared dishes, kissing, shared food — most often in childhood. It is worth getting tested for pain in the upper abdomen, heartburn, heaviness after meals, nausea, bad breath without a dental cause, and for anyone whose family has had ulcers or stomach cancer. The international consensus (Maastricht VI) recommends finding and treating the bacterium even in carriers without symptoms.
The urea breath test: how it works
The principle is beautifully simple: H. pylori produces the enzyme urease, which no other stomach bacterium has. You drink a solution of urea labelled with marked carbon; if the bacterium is present, urease breaks down the urea and the labelled carbon is released in your breath, where the analyser detects it. The procedure takes 15–30 minutes: first a “before” breath sample, then the solution, a pause and an “after” sample. Accuracy is 90–95%, and the result is usually ready the same day. The test is non-invasive, needs no blood draw and is suitable for adults and children over 6.
Stool antigen test: when it is more convenient
The laboratory finds proteins of the bacterium itself in the stool — direct proof of an active infection rather than a trace of a past encounter. Accuracy is comparable to the breath test, and preparation is simpler: there is nothing to drink and no tube to breathe into, so the method is ideal for small children and people who find the breath procedure hard. The stool is collected into a clean container — the rules are the same as in our guide to preparing a stool sample. The result is usually ready the next working day.
Blood antibodies: honest limitations
A blood test for IgG antibodies to H. pylori is the most accessible and cheapest method, but it has a fundamental limitation: antibodies stay in the blood for years after the bacterium has been eliminated. So blood is only suitable for a first-ever screening (“has the body ever met the bacterium”) and is entirely unsuitable for checking after treatment. Positive antibodies in someone who has already been treated do not mean the treatment failed.
Preparation: where people most often go wrong
The main enemy of reliability is proton pump inhibitors (omeprazole, pantoprazole and other “heartburn pills”): they suppress the bacterium without killing it, and the tests show a false negative. They are stopped 2 weeks before the breath test and the stool test — as agreed with the prescribing doctor. Antibiotics and bismuth drugs are stopped 4 weeks before. The breath test is done fasting: 4–6 hours without food, no smoking in the morning. Fasting is not required for the stool test. If PPIs cannot be stopped for medical reasons, tell the laboratory and your doctor: the result will be interpreted with that in mind.
Positive result: next steps
With a positive test you go to a general practitioner or a gastroenterologist, who prescribes an eradication regimen — usually a PPI combined with two antibiotics for 10–14 days. Do not pick regimens from the internet yourself: resistance to clarithromycin is growing, and the choice of drugs depends on the region and your previous antibiotic courses. Cure is checked no earlier than 4 weeks after the last tablet and 2 weeks after stopping PPIs, with a breath test or stool antigen. If the first course did not work, the next step is a gastroscopy with testing of the bacterium's antibiotic sensitivity.
Gastroscopy with a urease test: when it cannot be avoided
The endoscopic method remains a back-up but is irreplaceable in three situations: “alarm” symptoms (weight loss, vomiting blood, black stools, unexplained anaemia, symptoms starting after age 45–50), failure of the first eradication course — the bacterium is then cultured from the biopsy and its antibiotic sensitivity determined — and the need to examine the lining itself. During the gastroscopy a small piece of the lining is placed in a urea medium (rapid urease test) or sent for histology. If you are having a gastroscopy for another reason, it makes sense to ask the doctor to take an H. pylori test at the same time — it adds a couple of minutes to the procedure.
Test the whole family?
Because infection spreads through everyday contact and most often within families, when the bacterium is found in one family member doctors often recommend testing the others — especially if someone has stomach complaints. Children under 6 without symptoms are usually not tested. After successful eradication, reinfection in adults is rare — about 1–2% per year — so routine “just in case” testing after confirmed cure is not needed.
- Breath test and stool antigen — accuracy >90%
- Antibodies — initial screening only, not for checking treatment
- Stop PPIs 2 weeks before, antibiotics 4 weeks before
- Breath test — fasting, 15–30 minutes
- Check after treatment — after 4+ weeks, not with antibodies
- First course failed — gastroscopy with sensitivity testing
Results are in — what next?
Upload your report to MedProtect: the app will explain the markers and look at the neighbouring numbers too — gastritis often goes hand in hand with iron and B12 deficiency.
Frequently asked questions
Which H. pylori test is the most accurate?
The urea breath test and the stool antigen test are both more than 90% accurate. Blood antibodies are convenient for initial screening but are not suitable for checking after treatment: they stay positive for years.
Is preparation needed for the breath test?
Yes: fasting (4–6 hours without food); antibiotics and bismuth are stopped 4 weeks before, and proton pump inhibitors (omeprazole and similar drugs) 2 weeks before, as agreed with your doctor — they suppress the bacterium and cause a false negative.
Can H. pylori be checked without a gastroscopy?
Yes, this is the standard: the breath test, stool antigen and blood antibodies are non-invasive methods. A gastroscopy with biopsy is needed for “alarm” symptoms or when the first course of treatment fails.
How do I check that the treatment worked?
Follow-up is done with a breath test or a stool antigen test no earlier than 4 weeks after the end of the course and 2 weeks after stopping PPIs. Antibodies are not suitable for follow-up.
Should it be treated if the test is positive but my stomach does not hurt?
Current guidelines (Maastricht VI) recommend eradication for all carriers: the bacterium raises the risk of gastritis, ulcers and stomach cancer. The final decision rests with a gastroenterologist who takes your history into account.
Sources
- Maastricht VI/Florence consensus report on the management of H. pylori infection — Gut, 2022 (checked 15.09.2026)
- Clinical guidelines “Peptic ulcer disease” — Russian Ministry of Health, 2024 (in Russian; checked 15.09.2026)