H. pylori has different reference values depending on the means of testing. The normal value of carbon 13 breath test is 0~4dpm and carbon 14 breath test is 0~100dpm. The detection means of H. pylori include breath test, gastroscopic biopsy, H. pylori antibody test, etc. Among them, there are reference values in the report of breath test, and the normal value of carbon 13 breath test is 0~4dpm, and the normal value of carbon 14 breath test is 0~100dpm. After Helicobacter pylori infection, patients mostly have belching, bad breath and other symptoms, and some patients may not have obvious symptoms. Patients with H. pylori infection should actively cooperate with their physicians for treatment, and be given a triple combination of drugs (e.g., omeprazole, clarithromycin, amoxicillin) or a quadruple combination of drugs (e.g., omeprazole, clarithromycin, amoxicillin, colloidal bismuth in pectin). For H. pylori testing, it is recommended to be guided by a doctor to choose the appropriate test and to have the specific test results judged by a medical professional.