H. pylori infection has been clearly identified as the cause of peptic ulcers and even gastric cancer, so testing for H. pylori has become part of daily practice. The more commonly used clinical test is the H. pylori breath test, in order to ensure the accuracy of the test results, so what do you need to pay attention to when doing the test? 1, H. pylori test must stop using PPI for at least 2 weeks, stop using antibiotics, bismuth and certain Chinese medicine with antibacterial effect for at least 4 weeks. 2, the day of the test patients need to fasting or eat 3 hours before the breath test. 3.The capsule should be taken whole and not bitten. 4.The test should be performed one week after the gastrointestinal bleeding has stopped. 5, partial gastrectomy may cause rapid emptying of the isotope from the stomach, which will cause a significant decrease in the accuracy of the detection of H. pylori.