There are three main methods for the identification of H. pylori, one is serologic test, the second is c13, c14 test, and the third is rapid urease test (RUT). 1. Serological testing: mainly through blood sampling to detect H. pylori antibodies in the serum, its positive is not necessarily the current infection, can not be used for eradication of post-treatment review, so its clinical application is limited, usually used for epidemiological investigations. Hp antibody positivity can be regarded as a current infection if the tested person has not received anti-Hp treatment in the past. 2. c13, c14 test: this method is to determine the value of Helicobacter pylori by urease breath test with oral medication, which is more commonly used in clinical practice. However, it is necessary to stop using proton pump inhibitors for at least 2 weeks and antibacterial drugs, bismuth and certain traditional Chinese medicines with antibacterial effect for at least 4 weeks before the test. 3. Rapid urease test (RUT): This is the gold standard for detection. If a biopsy is needed for gastroscopy and the patient has no contraindications to biopsy, RUT is clinically recommended for detecting H. pylori. People infected with H. pylori are advised to consult a doctor in a timely manner and follow the doctor’s instructions for eradication treatment.