First, it is important to clarify that a gastroscopy and a Helicobacter pylori test are two completely different methods. Generally speaking, a gastroscopy cannot detect whether there is a Helicobacter pylori infection. A gastroscopy specifically involves passing through the pharynx, esophagus, stomach, and finally reaching the descending part of the duodenum. It allows clear observation of whether there is inflammation, ulcers, or neoplastic diseases in the upper gastrointestinal tract, and it is the clearest and most direct method for examining the upper gastrointestinal tract. Helicobacter pylori testing, on the other hand, can generally be conducted in several ways. Firstly, blood can be drawn to test for Helicobacter pylori antibodies. Secondly, a breath test can be done, which is currently the most commonly used method, such as the carbon-13 or carbon-14 breath tests. Other methods include taking a biopsy during gastroscopy for a rapid urease test, and culturing bacteria from a biopsy. Therefore, gastroscopy cannot be used to test for Helicobacter pylori.