Helicobacter pylori stool antigen
What this test measures
This test looks for proteins of the stomach bacterium Helicobacter pylori in a stool sample. It shows current infection.
Why doctors request it
The usual first test for H. pylori in the UK, requested for indigestion and before some medicines, and to confirm the bacterium has gone after treatment.
What commonly pushes it up
- Current H. pylori infection
What commonly pushes it down
- A negative result is the usual finding
Everyday reasons for a value outside the range
- Acid-suppressing medicines and recent antibiotics can make it read falsely negative, so the lab asks for two weeks off them
About the sample
Two weeks off acid-suppressing tablets and four weeks after any antibiotics.
Upload a photo or PDF and see every line against the range your lab printed, explained in plain English. First report free.
Read my report freeThis is an educational summary of results you uploaded. It is not medical advice, a diagnosis or a treatment plan, and it does not replace the doctor who requested the test. If you are worried, or a result is marked outside range, discuss it with your doctor. Written and reviewed by a UK consultant physician. Reference ranges vary between laboratories.