Ajax Harwood Clinic

H. pylori (stomach bacteria) test

Full name: Helicobacter pylori testing (urea breath test, stool antigen, or serology)

This test is useful only in specific situations — it's not right for everyone who asks about it.

What this test is

H pylori is a common stomach bacteria. It can cause ulcers and stomach irritation. There are a few ways to test for it. These are a breath test, a stool test, and a blood antibody test. Testing makes sense if you have stomach pain or certain risk factors. It also makes sense if you have unexplained low iron. One thing to know: the blood antibody test can stay positive long after an infection is gone. So it cannot tell your doctor if you still have an infection that needs treatment. The breath and stool tests are better at confirming an infection that is active now. If you test positive, the plan is to treat it with antibiotics. That is the whole point of testing.

Want to see the full clinical reasoning? The reference we use for this test is open to anyone — it is detailed and written for clinicians, and you are welcome to read it.

Open the clinician reference →

Looking for other tests, or more on a condition an ND raised? Explore ask.ajaxharwoodclinic.com →

General health information for Ajax Harwood Clinic patients and the public — not medical advice, and not a substitute for seeing your own doctor. Last reviewed 2026-09-23.