Blood tests to check for H. pylori infection are not accurate. H. pylori antibodies in serum blood tests do not correctly reflect whether H. pylori is currently infected or not. Because once infected with H. pylori, after taking medication to cure it, the antibody will exist in the serum for 6 months before it gradually disappears, so a positive blood test for serum H. pylori antibody can only indicate that it is currently infected with H. pylori or once infected with H. pylori, so a positive result is generally unable to determine whether or not it is being infected. Currently in the clinical rarely use blood test to check whether the infection of Helicobacter pylori, in order to know whether there is Helicobacter pylori infection, it is recommended to do carbon 13 breath test and carbon 14 breath test, the operation of this test is relatively simple, high security, high accuracy, once the results of the test show that the infection of this bacterium, it is recommended to follow the doctor’s instructions in time to use drugs to treat.