A H. pylori breath test result below 100 dpm is normal. Blowing is called a breath test and is a common diagnostic method for H. pylori infection. The diagnostic method is not only accurate, but is also a non-invasive test and is suitable for a particularly wide range of people. The patient is asked to swallow a urea pill, and the exhaled gas is collected and the carbon 14 marker in the gas is measured. When the patient’s test result is below 100 dpm, the patient’s intragastric environment is healthy and negative. Once the test value reaches 100 dpm or more, it is evidence that the stomach has been infected with H. pylori and a decision can be made whether treatment is needed based on the patient’s symptoms. The breath test should be performed on an empty stomach and avoid the use of antibiotics, which can affect the test results and even lead to false negatives.