There is no self-testing method for H. pylori, and medical consultation is required to confirm the diagnosis through breath test, immunological test, fecal test, and direct smear microscopy. 1. Breath test: including carbon 13 or carbon 14 breath test, these two methods are relatively high in accuracy, and the operation is relatively simple, and is widely used in the clinic. 2. Immunological test: a small amount of blood is taken from the patient, and the corresponding reagent is used to detect the level of antibodies against Helicobacter pylori, and an elevated result indicates the presence or former presence of the infection. 3. Stool test: the patient’s stool is taken for laboratory tests, if the presence of proteins related to H. pylori infection is found, it can also play an auxiliary diagnosis. 4. Direct smear microscopy: During gastroscopy, tissue can be taken for pathologic biopsy, which can help to clarify the diagnosis if H. pylori is found. To determine the presence of H. pylori, it is recommended to go to the hospital in a timely manner, after the doctor’s interview, combined with the patient’s own condition, choose the appropriate examination program.