Definition of OLGA and OLGIM gastric cancer risk staging methods OLGA (operative link for gastritis assessment) OLGIM (operative link for gastric intestinal metaplasia assessment) is a method developed from the New Sydney System for the classification of chronic gastritis. OLGIM (operative link for gastric intestinal metaplasia assessment) is a gastric cancer risk staging method developed from the New Sydney system of chronic gastritis classification. The endoscopic biopsy criteria are based on the number of atrophic (OLGA) or intestinal hyperplasia (OLGIM) glands in the observed glands, and the area of atrophy (including intestinal hyperplasia) or intestinal hyperplasia (intestinal hyperplasia only) is calculated. Association with gastric cancer Those with OLGA or OLGIM stage III or IV are at high risk of gastric cancer. the reproducibility of OLGIM assessment and association with the risk of gastric cancer development is better than OLGA (atrophy determination is subjective, intestinal metaplasia is easily identified). This is a relatively accurate method for assessing gastric mucosal atrophy/intestinal metaplasia. Follow-up criteria