The most commonly used test for detecting Helicobacter pylori at present is the breath test, which generally comes in two types: carbon-13 and carbon-14, though the testing method is basically fixed. A barium meal test can only detect whether there are large gastric ulcers or the presence of gastric cancer, but Helicobacter pylori is quite small and cannot be detected through a barium meal. Therefore, the detection of Helicobacter pylori typically relies on traditional methods, such as breath tests or tests performed during gastroscopy.