H. pylori infection is not graded, only infected and non-infected. Commonly used non-invasive methods to detect H. pylori infection are C13 breath test, C14 breath test, serologic antibody test, and fecal antigen test.
C13 breath test reference value range: 0~4, if the test value is greater than 4, it will be judged as positive, that is, there is H. pylori infection; C14 breath test reference value range: 0~100, greater than 100, it will be judged as positive, of course, different test kits are used, the reference value range may change, and the test report will be labeled.
In addition, the results of the breath test may be affected by certain factors, such as taking antibiotics or proton pump inhibitors, certain traditional Chinese medicines, gastric surgery, etc. before the test, which may affect the accuracy of the test results.
Serological antibody test and fecal antigen test are not affected by the above factors, but it is not possible to determine whether the infection is a current or a previous infection because serological antibodies persist for a certain period of time after treatment of H. pylori infection.
Breath test and fecal antigen test can make up for these shortcomings. Therefore, different methods should be chosen according to different situations in order to accurately determine whether H. pylori infection is present or not, and you can consult the gastroenterology department.