Pediatric gastritis screening modalities, divided into two categories, invasive and non-invasive, are as follows: 1. Non-invasive tests: including pepsin and pancreatic enzyme tests, as well as H. pylori testing. The means of detection of H. pylori infection, including C-13 urease breath test, H. pylori antibody IgG test, gastroscopic biopsy, H. pylori culture, and PH test paper. If gastroscopy is not performed, the clinical most commonly used carbon 13 urease breath test, serum H. pylori antibody test; 2. Invasive testing: including painless gastroscopy, general gastroscopy, which is the gold standard for diagnosis.