H. pylori Testing UK: Options and Accuracy

Medically reviewed and written by Dr Zeeshan Afzal, MBBS — Medical Content Lead, Welzo. Last reviewed: August 2026. Next review due: August 2027.

If you have been living with burning stomach pain, persistent indigestion or unexplained nausea, an H. pylori test UK patients can access through their GP or privately is often the single most useful next step. Helicobacter pylori is a spiral-shaped bacterium that colonises the stomach lining, and it is the most common cause of stomach and duodenal ulcers worldwide. The good news is that testing is simple, non-invasive in most cases, and — when done correctly — highly accurate. This guide explains every test available in the UK, how accurate each one really is, how to prepare so your result is not falsely negative, and what to do next. For broader context on digestive wellbeing, start with our complete guide to gut health in the UK, our overview of H. pylori infection, and the full Welzo gut health range. Because H. pylori and its treatment both affect the stomach and the wider microbiome, many people also want to know how to protect their digestion afterwards. Our most-read resources on that are the Welzo probiotics collection, Akkermansia muciniphila, Citrus Pectin Powder, Welzo Ultra Purity Berberine and Welzo Ultra Purity TUDCA. None of these are treatments for H. pylori — eradication requires prescribed antibiotics — but they are commonly used to support digestive health once treatment is complete.

Key takeaways

• The two tests recommended by NICE for diagnosing H. pylori in the UK are the carbon-13 urea breath test and the stool antigen test. Both are non-invasive.
• In a Cochrane review of 101 studies and 11,003 people, the 13C urea breath test had the highest diagnostic accuracy of the non-invasive options.
• Preparation determines accuracy. Stop proton pump inhibitors for 2 weeks and antibiotics or bismuth for 4 weeks before testing, or you risk a false negative.
• Blood antibody (serology) tests are not recommended as a first-line UK test — they can stay positive for years after an infection has been cleared.
• Endoscopy with biopsy is reserved for people with alarm symptoms or those already having a gastroscopy for another reason.
• If you test positive, treatment is prescription-only eradication therapy, followed by a re-test — usually a urea breath test — to confirm the infection has gone.

Table of contents

• What is H. pylori, and why does testing matter?
• Who should have an H. pylori test in the UK?
• H. pylori test options in the UK compared
• How accurate are H. pylori tests?
• How to prepare so your result is reliable
• NHS testing vs private and postal testing
• Understanding your results
• What happens after a positive test
• Supporting your gut after H. pylori treatment
• When to see a GP urgently
• Frequently asked questions
• References

What is H. pylori, and why does testing matter?

Helicobacter pylori is a gram-negative, helical bacterium that has adapted to survive in one of the most hostile environments in the body: the acidic stomach. It produces large quantities of an enzyme called urease, which converts urea into ammonia and carbon dioxide, creating a neutral micro-environment around the bacterium and allowing it to burrow through the protective gastric mucus layer and settle against the stomach lining. That same urease reaction is what the urea breath test exploits to detect it.

Electron micrograph of H. pylori showing its multiple flagella. Image: Yutaka Tsutsumi, MD, Fujita Health University, via Wikimedia Commons (free use, any purpose).

How common is H. pylori in the UK?

H. pylori is one of the most widespread chronic bacterial infections in the world. A 2024 systematic review and meta-analysis published in Gastroenterology found that global prevalence in adults fell from 52.6% before 1990 to 43.9% between 2015 and 2022. In the UK, NHS patient information estimates that around 40% of people carry the bacterium at some point, although only about 1 in 10 of those infected will ever develop symptoms or complications. Guts UK, the national digestive health charity, notes that infection is becoming less common in the UK and that acquiring it as an adult is rare — most people who carry it picked it up in childhood.

An audit of English microbiology laboratories found that individual labs reported H. pylori stool antigen positivity rates ranging from 1% to 33%, with a mean of 13%. In other words, in a typical UK primary care population being tested for indigestion, roughly one in eight tests comes back positive.

What H. pylori does to the stomach

Once established, H. pylori triggers chronic inflammation of the stomach lining — gastritis. In most carriers this stays silent for life. In a minority it progresses to peptic ulceration of the stomach or duodenum, and in a much smaller group, to atrophic gastritis and gastric cancer. H. pylori was classified as a Group 1 (definite) human carcinogen by the International Agency for Research on Cancer in 1994, and roughly 89% of non-cardia gastric cancers worldwide are attributable to the infection. Guts UK puts the individual risk in perspective: between 1 and 3 people in every 100 with H. pylori go on to develop stomach cancer.

How H. pylori crosses the stomach's protective mucus layer by releasing urease. Image: National Science Foundation, via Wikimedia Commons (public domain).

Symptoms that should prompt a test

H. pylori has no signature symptom, which is exactly why testing rather than guessing matters. The picture that most often leads to a test is dyspepsia: upper abdominal pain or discomfort, heartburn, acid reflux, nausea, early fullness or bloating persisting for four weeks or more. These symptoms overlap heavily with functional dyspepsia, acid reflux, peptic ulcer disease, gallbladder problems, IBS and SIBO — so a test result changes management in a way that symptom pattern alone cannot.

Who should have an H. pylori test in the UK?

The NICE "test and treat" strategy

NICE guideline CG184 recommends offering H. pylori "test and treat" to adults with dyspepsia. The logic is straightforward: rather than sending everyone with indigestion for endoscopy, primary care tests non-invasively, treats those who are positive, and manages the rest as functional dyspepsia or reflux. NICE states that the initial options are either empirical full-dose PPI therapy for four weeks or testing for and treating H. pylori, and that there is currently insufficient evidence to say which should come first.

Other situations where testing is indicated

• Confirmed peptic ulcer — current or previous gastric or duodenal ulcer.
• Gastric MALT lymphoma — eradication is part of management.
• First-degree relatives of someone with stomach cancer — Guts UK advises that parents, siblings and children of a person with gastric cancer should be tested.
• Unexplained iron deficiency anaemia or immune thrombocytopenic purpura, once other causes have been excluded.
• People starting long-term NSAIDs or aspirin in some local pathways, because H. pylori and NSAID-related stomach damage are independent ulcer risk factors.
• Persistent dyspepsia after a course of PPI, where the diagnosis remains unclear.

Who does not usually need a test

Routine testing of people with no symptoms is not recommended in the UK, because treating asymptomatic carriers has not been shown to improve outcomes at population level. If your predominant symptoms are heartburn and acid regurgitation, GORD is the more likely diagnosis and H. pylori status is less relevant — read our guide to long-term omeprazole use if you are already on acid suppression. Equally, if your symptoms are lower down — cramping, altered bowel habit, wind — a stool test or gut microbiome test may be more informative than H. pylori testing.

Red flag symptoms: do not wait for a test

NICE is explicit that H. pylori status should not delay a suspected cancer referral. Seek urgent medical assessment — and request an urgent direct-access endoscopy pathway — if you have difficulty swallowing (dysphagia), are aged 55 or over with unexplained weight loss and upper abdominal pain or reflux, are vomiting persistently, have vomited blood or passed black tarry stools, have unexplained iron deficiency anaemia, or have a palpable abdominal mass. Our article on when to see a GP about stomach symptoms covers this in more detail.

H. pylori test options in the UK compared

1. The carbon-13 urea breath test

How it works

You give a baseline breath sample, drink a solution containing urea labelled with a harmless, non-radioactive carbon-13 isotope, wait around 30 minutes, then give a second breath sample. If H. pylori is present, its urease splits the labelled urea, releasing labelled carbon dioxide that is absorbed into the blood and exhaled. The lab compares the two samples. The 13C version involves no radiation at all; a 14C variant exists but uses a trace of radioactivity and is less commonly offered in the UK.

Strengths and limitations

The UBT is the most accurate non-invasive test and the one NICE names for re-testing after treatment. Its limitation in practice is availability: several NHS guidelines note that although the breath test is more accurate, it is not as widely available in primary care as the stool antigen test, which is why most GP requests in England are stool-based. It also requires a clinic visit or a carefully followed postal kit protocol, and a period of fasting beforehand.

2. The stool antigen test

How it works

A small stool sample is analysed — usually by monoclonal ELISA in a hospital laboratory — for H. pylori antigens (fragments of bacterial protein) shed into the gut. A positive result indicates current, active infection. Because it detects the organism rather than antibodies, it can also be used to confirm eradication after treatment.

Strengths and limitations

This is the workhorse of NHS H. pylori testing. An audit of English microbiology laboratories found that 94% of responding labs used stool antigen testing as their non-invasive diagnostic method. It needs no clinic appointment, is cheap, and performs comparably to breath testing in most head-to-head UK laboratory practice. Sample handling matters: samples should reach the lab promptly, and many labs cannot run stool antigen alongside routine stool culture or C. difficile toxin testing on the same specimen. If you are unsure what a normal stool even looks like, our Bristol Stool Chart guide is a useful reference.

3. Blood antibody testing (serology)

Serology detects IgG antibodies to H. pylori. Its central weakness is that antibodies persist for months or years after successful eradication, so a positive result cannot distinguish a current infection from one cleared a decade ago. NHS guidance describes serology as less accurate than the other tests and notes that it often remains positive even after successful treatment, and NHS inform states that the blood test has now largely been replaced by the stool antigen test. NICE's quality standard adds that serological tests are less reliable in older people, so their suitability for those over 65 should be considered carefully. Serology is not a test of cure.

The one practical advantage: serology is the only common test not made falsely negative by PPIs, antibiotics or bismuth. In someone who genuinely cannot stop acid suppression, a locally validated laboratory serology test may still have a role — but that decision belongs with your GP.

4. Endoscopy-based testing

If you are having a gastroscopy — for alarm symptoms, suspected ulcer, or persistent unexplained symptoms — biopsies can be taken at the same time. A rapid urease (CLO) test gives an answer within hours, histology under Giemsa or Warthin-Starry stain is the reference standard used in accuracy studies, and culture allows antibiotic susceptibility testing when standard eradication has failed twice. Endoscopy is not used purely to diagnose H. pylori, because non-invasive testing is as effective for managing uncomplicated dyspepsia.

5. Pharmacy and home test kits

Rapid self-test kits sold by high street pharmacies and online retailers are usually lateral-flow stool antigen or fingerprick antibody devices. The stool antigen kits detect active infection; the antibody kits carry all the interpretation problems described above. Rapid lateral-flow devices are generally less accurate than laboratory ELISA analysis, and manufacturers themselves position them as screening rather than diagnostic tools. Two practical rules: choose a kit that is analysed by a UKAS-accredited laboratory rather than read at home if you want a result your GP can act on, and follow the same medication washout rules as for any other test. A home kit result should always be discussed with a clinician before treatment.

How accurate are H. pylori tests?

What the Cochrane evidence shows

The most rigorous synthesis available is a Cochrane systematic review of non-invasive H. pylori tests, which pooled 101 studies involving 11,003 participants, of whom 53.1% had confirmed infection. Comparing tests against endoscopic biopsy with histology, the review found a statistically significant difference in accuracy between the four test types.

*Cochrane's modelled cohort assumed 53.7% prevalence and 90% specificity, producing 46 false positives per 1,000 tested across all four tests. The review authors were candid about the limitations: almost all included studies were of poor methodological quality, the positivity thresholds varied widely, and the comparison between tests was largely indirect.

Importantly, those pooled figures include older polyclonal stool antigen assays. When analysis is restricted to modern monoclonal stool antigen tests — the type used by NHS laboratories today — a systematic review of 22 studies covering 2,499 patients cited in Public Health England's primary care guidance reported sensitivity of 94% (95% CI 93–95) and specificity of 97% (95% CI 96–98). After treatment, monoclonal stool antigen testing achieved sensitivity of 93% and specificity of 96%. This is why NHS laboratory guidance describes stool antigen performance as comparable to urea breath testing and superior to serology.

What sensitivity and specificity mean for your result

Sensitivity is the proportion of infected people the test correctly identifies; specificity is the proportion of uninfected people it correctly clears. Neither tells you directly how likely your own result is to be right — that depends on how common the infection is in people like you. Here is a worked illustration using a monoclonal-quality test (sensitivity 94%, specificity 95%) in a UK primary care population where roughly 20% of those tested are infected:

In this scenario, a positive result is correct about 82% of the time and a negative result is correct about 98% of the time. The practical message: a negative test in someone properly prepared is very reassuring, while a positive result is usually acted on because the treatment is short and the downside of leaving infection untreated is significant. (This table is an illustration of test mathematics, not data from a specific UK study.)

Causes of false negative results

• Proton pump inhibitors. Evidence summarised by Public Health England shows that when PPIs are started in H. pylori-positive patients, stool antigen and breath test values fall into the negative range within about a week in roughly 30% of patients, and revert to positive around two weeks after stopping.
• Recent antibiotics or bismuth, which suppress bacterial numbers without eradicating the infection.
• Upper gastrointestinal bleeding. Blood in the stomach or stool can interfere with both breath and stool antigen tests, producing variable and sometimes falsely negative results.
• Sampling and handling errors — a stool sample left too long before reaching the lab, or a breath sample taken at the wrong interval.

Causes of false positive results

• Other urease-producing bacteria in the mouth or an achlorhydric stomach can theoretically contribute to a positive breath test.
• Serology cross-reactivity, and persistence of antibodies long after a cleared infection.
• Testing a low-risk, asymptomatic population, where even a highly specific test produces a higher proportion of false positives — one of the reasons the UK does not screen asymptomatic people.

How to prepare so your result is reliable

This is the part patients most often get wrong, and it is the single biggest determinant of whether your H. pylori test result can be trusted.

Managing symptoms during the washout

Two weeks without a PPI is uncomfortable for some people. Options to discuss with your GP or pharmacist include switching temporarily to an H2 receptor antagonist (NICE recommends H2RA therapy where PPI response is inadequate, and some UK pathways use it during the washout), or using antacids and alginates for symptom relief. Do not stop a PPI without advice if it was prescribed for a healing ulcer, Barrett's oesophagus or bleeding risk. If you are exploring non-drug approaches to reflux discomfort in the meantime, our guides to slippery elm and zinc carnosine cover what the evidence does and does not show. These are supportive measures, not substitutes for prescribed medication.

One important exception

If you could not stop your PPI and the test comes back positive, that result is still considered reliable — acid suppression causes false negatives, not false positives. A negative result taken while on a PPI, however, should be repeated at least two weeks after stopping.

NHS testing vs private and postal testing

Testing through the NHS

Book a GP appointment and describe the duration and pattern of your symptoms, any alarm features, all medicines including over-the-counter PPIs, and any previous H. pylori treatment. If testing is appropriate, your GP will usually request a stool antigen test through the local laboratory, or a urea breath test if the service is available locally. Testing and any subsequent eradication prescription are free at the point of use, and prescription charges apply as normal in England.

Private and postal testing

Private options in the UK fall into three groups: postal stool antigen kits analysed by an accredited laboratory, breath tests performed at a private clinic, and pharmacy self-test kits read at home. Indicative prices at the time of writing run from roughly £8–£30 for a self-read pharmacy kit, around £30–£100 for a lab-analysed postal stool antigen test, and more for a clinic-based breath test — but prices change, so check current listings.

What to look for in a private test

• Analysis by a UKAS-accredited laboratory, not a home-read device, if you want a result your GP can act on.
• A test that detects antigen or active infection, not just antibodies.
• Clear pre-test instructions covering the PPI and antibiotic washout.
• A written report you can download and share with your GP.
• A defined route to clinical review if the result is positive — you will need a prescription either way.

If you are already comparing at-home testing options for digestive symptoms more broadly, our comparisons of SIBO breath testing, coeliac testing and food intolerance testing explain which tests have genuine clinical validity and which do not.

Understanding your results

A positive result

A positive breath or stool antigen test means active infection. This is not an emergency, and it does not mean you have an ulcer or cancer — most carriers have neither. It means you should be offered eradication therapy, which is a short course of a PPI plus two antibiotics, prescribed according to your local antimicrobial guidance and your allergy and antibiotic history.

A negative result

A negative result in someone who observed the washout rules makes H. pylori an unlikely cause of your symptoms. Your GP will then consider functional dyspepsia, GORD, medication side effects, gallbladder disease, low stomach acid, gut dysbiosis and other causes. Persistent symptoms despite a negative test always warrant review rather than repeated self-testing.

An equivocal or borderline result

Laboratories occasionally report borderline values. The usual response is to repeat the test after confirming the correct washout period, or to use a different modality — for example, a breath test after an equivocal stool antigen result.

What happens after a positive test

Eradication therapy in the UK

UK treatment usually involves a seven-day triple-therapy regimen: a proton pump inhibitor twice daily plus two antibacterials, with the specific antibiotics chosen according to local resistance patterns, penicillin allergy status and previous antibiotic exposure. Because each previous course of clarithromycin, metronidazole or a quinolone increases the risk of resistance, your prescriber will ask about your antibiotic history. Completing the full course exactly as prescribed is the strongest predictor of success.

Anatomy of the stomach. H. pylori most often colonises the antrum, closest to the pylorus. Image adapted from Gray's Anatomy, via Wikimedia Commons (public domain).

Re-testing to confirm eradication

Confirming that treatment worked is an essential step, not an optional extra. Key principles used across UK pathways:

• NICE recommends that where re-testing is performed, a urea breath test is used; office-based serological tests are not recommended for this purpose.
• Leave at least 4 weeks after finishing antibiotics and 2 weeks after stopping any PPI before re-testing. Some NHS services advise deferring stool antigen re-testing for around 8 weeks after eradication therapy, and Guts UK advises the breath test at least a month after treatment finishes.
• NICE's specific recommendation for re-testing applies to people with peptic ulcer, timed 6 to 8 weeks after beginning treatment depending on lesion size; routine re-testing is not offered to everyone.
• Never use a blood antibody test as a test of cure.

If a first-line course fails, second-line therapy uses different antibiotics; repeated failure may prompt endoscopy with culture and susceptibility testing.

Supporting your gut after H. pylori treatment

Eradication therapy is effective but disruptive: a week of two antibiotics plus high-dose acid suppression measurably perturbs the gut microbiome, and side effects such as nausea, taste disturbance, bloating and loose stools are common. Nothing here replaces treatment — but the recovery period is where sensible gut support belongs.

Probiotics alongside and after eradication

Probiotics have been studied as adjuncts to H. pylori eradication, most often Saccharomyces boulardii and various Lactobacillus strains, primarily for reducing antibiotic-associated side effects. Evidence quality varies by strain and outcome, so the honest position is that they are a reasonable supportive measure rather than a proven part of eradication. If you want to explore this, our evidence reviews cover Saccharomyces boulardii, probiotics after antibiotics, the best probiotics available in the UK, when to take them and possible side effects. Always tell your prescriber what you are taking, and check our note on probiotic safety if you are immunosuppressed or seriously unwell.

Rebuilding microbiome diversity

The most consistently supported approach to microbiome recovery is unglamorous: a varied, high-fibre, plant-diverse diet. Our guides to microbiome diversity, the best foods for gut health and gut barrier function explain the mechanisms. Some people add targeted supplements during this phase — the Welzo probiotics range, Akkermansia, Citrus Pectin Powder, Berberine or TUDCA — but these are general digestive and metabolic health products, not antimicrobial treatments for H. pylori, and berberine in particular has meaningful drug interactions worth checking before use. Browse the full gut health collection for the complete range.

When to see a GP urgently

Arrange urgent medical assessment, regardless of any test result, if you experience vomiting blood or material that looks like coffee grounds, black tarry stools, severe or sudden upper abdominal pain, difficulty swallowing, unintentional weight loss, or persistent vomiting. These features need assessment in their own right and take priority over H. pylori testing.

Frequently asked questions about H. pylori testing in the UK

What is the best H. pylori test in the UK?

For accuracy, the carbon-13 urea breath test performs best — Cochrane data put its sensitivity at 0.94 at a fixed specificity of 0.90, the highest of the non-invasive options. In practice, the monoclonal stool antigen test is the one most NHS laboratories use, and modern monoclonal assays report sensitivity around 94% and specificity around 97%. Both are recommended by NICE; the breath test is preferred for confirming eradication.

Can I get an H. pylori test on the NHS?

Yes. If you have dyspepsia lasting four weeks or more, your GP can request an H. pylori test — usually a stool antigen test, sometimes a urea breath test — free of charge under the NICE "test and treat" strategy. Testing of people with no symptoms is not routinely offered.

How much does a private H. pylori test cost in the UK?

Indicative prices range from roughly £8–£30 for a pharmacy self-test kit, around £30–£100 for a postal stool antigen test analysed by an accredited laboratory, and more for a clinic-based urea breath test. Prices vary by provider, so check current listings. A positive result will still require a GP or private prescriber for treatment.

Do I need to stop omeprazole before an H. pylori test?

Yes. NICE advises a two-week washout after proton pump inhibitor use before testing with a breath test or stool antigen test. PPIs suppress the bacteria enough to produce false negative results — in around 30% of infected patients within a week of starting a PPI. Ask your GP before stopping if the PPI was prescribed for a healing ulcer or bleeding risk.

Are home H. pylori test kits from pharmacies accurate?

Rapid home-read kits are generally less accurate than laboratory ELISA analysis and are positioned by manufacturers as screening tools rather than diagnostic tests. Antibody-based home kits are particularly limited because they cannot distinguish current from past infection. A postal kit analysed by a UKAS-accredited laboratory is the more reliable home option, and any positive result should be confirmed with a clinician.

How long do H. pylori test results take?

Laboratory stool antigen results typically come back within a few days of the sample reaching the lab; NHS turnaround depends on local pathways. Rapid lateral-flow home kits give a result in minutes but with lower accuracy. Breath test samples are analysed centrally and usually reported within a few days.

Can an H. pylori test be wrong?

Yes. The commonest cause is a false negative from taking a PPI within two weeks, or antibiotics or bismuth within four weeks, of testing. Upper gastrointestinal bleeding can also reduce accuracy. False positives are less common but occur, particularly with antibody testing and in low-risk populations. A positive result taken while on a PPI is still considered reliable; a negative one should be repeated.

Do I need to fast before an H. pylori test?

For a urea breath test, yes — most protocols require several hours of fasting, typically four to six, and you should follow the specific instructions supplied with your test. No fasting is needed for a stool antigen test or a blood test, but the medication washout rules still apply to stool antigen testing.

How soon after treatment should I be re-tested?

Leave at least four weeks after finishing antibiotics and two weeks after stopping any PPI. Some UK services advise deferring stool antigen re-testing until around eight weeks after eradication therapy, and Guts UK advises a breath test at least a month after treatment ends. NICE times re-testing for people with peptic ulcer at six to eight weeks after starting treatment.

Does a blood test show if I still have H. pylori?

No. Blood antibody tests detect immune memory of exposure and can remain positive long after successful eradication, so they cannot be used as a test of cure. NICE recommends a urea breath test for re-testing, and does not recommend office-based serological tests.

About the author

Dr Zeeshan Afzal, MBBS is a UK-registered medical doctor and Medical Content Lead at Welzo, where he writes and clinically reviews evidence-based health content. This article was researched against current NICE guidance, NHS clinical resources, UK Health Security Agency primary care guidance and peer-reviewed systematic reviews, and is reviewed at least annually.

Medical disclaimer

This article is for general information and education. It is not a substitute for individual medical advice, diagnosis or treatment. H. pylori infection is treated with prescription-only antibiotics; do not attempt to self-treat. Do not stop or change prescribed medication, including proton pump inhibitors, without speaking to your GP or pharmacist. If you have alarm symptoms such as vomiting blood, black stools, difficulty swallowing or unexplained weight loss, seek urgent medical attention or contact NHS 111.

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