GI Investigations · Patient Guide
H. pylori Testing: Breath Test, Stool Test or Gastroscopy?
The stomach bug behind most ulcers is found by simple non-invasive tests — but sometimes the symptoms it's blamed for need a camera regardless.
Helicobacter pylori is a bacterium that colonises the stomach lining, drives most peptic ulcers, and contributes to long-term stomach cancer risk. Testing for it is simple and treatment usually succeeds. The judgement lies elsewhere: knowing when a positive test plus eradication genuinely closes the case, and when the symptoms deserve a gastroscopy whatever the bacterium is doing.
The three ways to test
The urea breath test and the stool antigen test are both accurate, non-invasive and suitable for first-line testing and for confirming eradication. The third route is biopsy during gastroscopy — used when endoscopy is happening anyway for the symptoms themselves. Accuracy of all three depends on preparation: acid-suppressing medication and recent antibiotics suppress the bacterium enough to cause false negatives.
When this test is usually indicated
- Indigestion-type symptoms in younger patients without alarm features — 'test and treat'
- A confirmed or previous peptic ulcer
- Before long-term anti-inflammatory (NSAID) therapy in higher-risk patients
- Confirming eradication after treatment, no sooner than four weeks after antibiotics
When it may not be the right test
- As a substitute for gastroscopy when alarm features exist — swallowing difficulty, weight loss, anaemia or vomiting need the camera
- Testing while on a proton-pump inhibitor without a two-week washout — false negatives are common
- Re-testing repeatedly after successful eradication in the absence of new symptoms
- Blood antibody testing to confirm cure — antibodies persist long after the bacterium is gone
The test answers 'is the bacterium there?' — not 'is the stomach healthy?'. Persistent symptoms after successful eradication, or any alarm feature at any point, move the question to gastroscopy.
What happens if you do need it
Eradication is a one-to-two-week course of combined antibiotics and acid suppression, curing the infection in the majority at first attempt. Where gastroscopy is indicated — for alarm features, persistent symptoms or ulcer follow-up — Mr Papettas performs it as a JAG-accredited endoscopist, with H. pylori biopsies taken at the same examination.
Frequently asked questions
How do you catch H. pylori?
Usually in childhood, via close contact — around a third of UK adults carry it, most without ever knowing.
Do I need to stop my acid tablets before testing?
Yes — typically two weeks off proton-pump inhibitors (and four weeks after any antibiotics) for breath and stool tests to be reliable.
Does everyone with H. pylori get symptoms?
No — most carriers are fine. Testing targets people whose symptoms or history make the answer actionable.
If my test is positive, do I still need a gastroscopy?
Only if alarm features, age-related risk or persistent symptoms warrant one — many younger patients are simply treated and re-tested.
How successful is eradication?
First-line treatment succeeds in most patients; if a confirmation test remains positive, a different antibiotic combination is used.
How is this arranged privately?
Testing, treatment and any gastroscopy through one consultation pathway — call 01926 935121.
Related reading
Unsure whether you need this test?
Mr Trif Papettas FRCS is a Consultant Colorectal and General Surgeon at Nuffield Health Warwickshire Hospital, Leamington Spa, and a JAG dual-accredited endoscopist. A consultation settles which investigation, if any, your symptoms actually need — and if a test is indicated, it can usually be arranged within days.
Self-referrals welcome · No GP letter required · Self-pay and insured patients seen at Nuffield Health Warwickshire Hospital, Leamington Spa CV32 6RW