The most commonly used clinical test for H. pylori is the carbon 13 breath test or carbon 14 breath test, with prices ranging from 220-280 yuan. Physical examination centers or hospitals can do this test, the reference value is less than 4, if the reference value is greater than or equal to 4, the patient is diagnosed with H. pylori infection. It is recommended that patients should first complete a gastroscopy to rule out the presence of organic diseases of the upper gastrointestinal tract, such as chronic gastritis, peptic ulcer, gastric cancer, gastric lymphoma, etc. The patient should also be given oral quadruple therapy, regular treatment for 10-14 days, and again after one month of discontinuation of the drug with the respiratory method of carbon 13 or carbon 14 to test whether it has been successfully eradicated.