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 situations. For example, in a patient with bleeding peptic ulcer or a major gastrectomy, the entire volume of the stomach is reduced, and in some patients with gastric Malte lymphoma, the breath test may be inappropriate due to bleeding and ulcers already using PPI preparations, and the surface area of the stomach is also small after the major gastrectomy, so the breath test may also be inappropriate. However, a positive H. pylori antibody test does not necessarily mean that you are truly infected with H. pylori, and it is best to have a breath test. 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.