[Practical issues in diagnostic tests for Helicobacter pylori infection: a narrative review]

H. pylori diagnosis is important because of the different clinical conditions associated with its presence, taking into account the different recommended indications for Helicobacter pylori erradication therapy and the broad spectrum of available diagnostic methods, it is necessary to achieve a timely diagnosis before and after eradication therapy. The success in the diagnosis is obtained from methods with high precision, those whose sensitivity and specificity is greater than 90%. This article aims to present advances in the various methods related to its detection, emphasizing their contributions and possible defects. The decision of the diagnostic method to apply will depend on the specific clinical context.