There are several methods to detect H. pylori infection in the stomach: 1, blood sampling to detect antibodies to H. pylori; 2, H. pylori detection through stool. With some agents and stool, if there is HP infection will produce a color change to the agent; 3, breath test, breath test has carbon 13 breath test, carbon 14 breath test, by blowing after taking oral pellets to detect the presence of H. pylori infection; 4, invasive detection of H. pylori. A small amount of stomach tissue was taken under gastroscopy with biopsy forceps and put into the drug reaction. It is relatively more accurate than the carbon 14 breath test and the mucosal test of the stomach. In addition to these tests, there are also pathological tests, which are performed on gastric biopsies that can be seen under a microscope to detect H. pylori organisms. These are the general methods of detection.