There are four ways to detect H. pylori in the clinic: serologic test, stool test, urea breath test and invasive test. 1. Serologic testing: Detecting antibodies to H. pylori in the stomach by drawing blood, but is rarely used nowadays. 2. Stool test for H. pylori: H. pylori antigen can be detected by using a specific reagent that reacts with stool and changes color. 3. Urea breath test: C₁₃ and C₁₄ urea breath test. Because H. pylori secretes the enzyme urease into the stomach, when C₁₃ or C₁₄-labeled urea capsules are taken orally, after they are broken down in the stomach, the markers contained therein enter the lungs with the bloodstream and are expelled as gas. The presence of the specific markers in the exhaled gas is detected to determine the presence of infection. 4. Invasive detection of H. pylori: A small amount of stomach tissue is taken under gastroscopy for urease test. At present, there are four ways to detect Helicobacter pylori, if you have the need for testing, it is recommended to go to the local regular medical institutions, the doctor according to the actual situation, recommend the appropriate testing methods.