There is no self-test for H. pylori. It can be detected by breath test, immunologic test, and endoscopic biopsy. 1. Breath test: By doing carbon 13 breath test and carbon 14 breath test, it can detect whether there is H. pylori infection or not, if the test result is positive, it is possible to be infected. 2. Immunological testing: Drawing venous blood to test the level of H. pylori antibodies, and the test result is out of the normal range of values, which helps to diagnose H. pylori infection. 3. Endoscopic biopsy: Gastroscopy to take part of the tissue specimen, found under the microscope H. pylori, can be clearly diagnosed. It is recommended to go to a regular medical institution for an interview and detailed examination, and follow the doctor’s instructions for treatment after diagnosis.