H. pylori and gastric cancer are closely related, so many people pay more attention to this issue, and many medical checkup centers are also checking H. pylori, and the most commonly used examination methods are invasive examination and non-invasive examination. The specific examination methods and contents are as follows: 1. Non-invasive examination: the patient has no pain and is relatively simple, so it is the most commonly chosen. The non-invasive test is the breath test, including carbon 13 or carbon 14 breath test, which allows the patient to drink a carbon 13 or carbon 14 isotopically labeled urea capsule, and after drinking it, after half an hour of blowing, it can be measured whether it is positive or negative for H. pylori, where carbon 13 can be used for pregnant women and children. Now is not too commonly used, has not been much promoted, refers to check the stool inside the H. pylori, because the gastric mucosa on the H. pylori will be discharged with the mucosa off, from the stool can be detected, now there are many units can not do this test; 2, invasive test: refers to the invasive operation, to rely on gastroscopy. When doing gastroscopy, the doctor takes a piece of tissue from the stomach for biopsy to produce a specimen, and then conducts a rapid urease test, or removes the biopsy for pathological sectioning and staining, and then sees small S-shaped bacteria on the surface of the mucosa, which can be seen by a very experienced pathologist. The removed biopsy specimens are homogenized and sent to the culture medium and then cultured, usually in a microaerobic environment for about 72 hours, to reveal the bacterial growth. Genetic testing, PCR, and in situ hybridization have emerged in recent years, but none of them have been fully promoted, but they can also be tested; another invasive test is the serum H. pylori antibody test, which is used for epidemiological investigations and can be used as a diagnostic basis for a positive 1st test if it has never been treated.