The C13 breath test28 suggests H. pylori infection, and the severity is related to the diseases accompanied by H. pylori infection, which varies from person to person. The C13 breath test is an important test for detecting H. pylori infection, and its normal value ranges from 0 to 4 dpm (decay per minute), with a value of more than 4 defined as a positive result. Therefore, a value of 28 on the C13 breath test suggests that the test taker is infected with H. pylori. However, the severity of H. pylori infection is not related to the value, but to the presence or absence of diseases associated with H. pylori infection, such as chronic gastritis, gastric ulcers, and even gastric cancer. In order to prevent the occurrence of gastric diseases associated with H. pylori infection, people with positive test results should be treated in a timely manner, under the guidance of a specialist and in accordance with medical advice, and should not take medication without authorization.