The serum test should firstly include a test for gastric H. pylori antibodies, in addition, if it is out of the normal range, it is positive, and if it is not out of the normal range, it is negative. A blood test for H. pylori is a test for H. pylori antibodies, which have a normal value of 0 to 15. If the test result is >15, it means that H. pylori is infected or has been infected with H. pylori before, which means it is positive. If the test result is between 0 and 15, it is negative. Note that serologic testing for H. pylori is not very accurate and does not confirm the presence of H. pylori infection. A carbon 13 or carbon 14 breath test is recommended, which is more accurate, simple and non-invasive. It is recommended that the results of the above labs be reviewed under the supervision of a physician after the test, and that if they are positive, regular treatment be carried out in a timely manner.