A positive RAC on gastroscopy indicates the absence of Helicobacter pylori infection. 1. Gastroscopy RAC refers to an examination of a large number of regular collections of veins in the body and fundus of the stomach, and the morphology of regular collections of veins is closely related to Helicobacter pylori infection. 2. Under normal circumstances, the fine veins appear as tiny red dots and red lines in the form of regular starfish under gastroscopy, which means positive RAC by gastroscopy. Therefore, when performing gastroscopy, you can determine whether you are infected with Helicobacter pylori based on the RAC test result. For gastroscopy RAC negative people need to combine with other related tests, such as carbon 13, carbon 14 breath test, etc., to clarify whether there is H. pylori infection, once diagnosed should be treated under the guidance of a doctor.