The H. pylori antibody test is a very common method of blood sampling in medical screening centers, but the specificity of the antibody test by blood sampling is relatively low. A positive antibody test only means that the person has been infected with H. pylori, but it is not necessarily a current infection, nor can it be used for follow-up after eradication treatment, so the use of H. pylori antibody testing in clinical practice is limited to specific cases. If a patient has a bleeding peptic ulcer or has undergone a major gastrectomy, the entire volume of the stomach is reduced, and some patients with gastric Malte lymphoma are already using PPI preparations due to bleeding and ulcers, the breath test may not be accurate, and the surface area of the stomach is also small after a major gastrectomy, so the breath test may not be accurate either, but a positive antibody test for H. pylori However, a positive antibody test does not necessarily mean that you are really infected with H. pylori, and it is best to have a breath test done again. Therefore, a positive H. pylori antibody test does not mean that you are now infected with H. pylori, but can only be used as a reference.