Abstract: Objective：To establish a rapid scoring system for acute appendicitis in patients with acute abdomen and verify its diagnostic efficacy.Methods：1 387 patients with acute abdomen were divided into appendicitis group and nonappendicitis group according to whether they were acute appendicitis or not.Compare the clinical characteristics and laboratory indexes between the two groups,established and verified the prediction model of acute appendicitis.Results：Leukocytes,percentage of neutrophils,body temperature,metastatic pain,aggravation of pain symptoms and other clinical characteristics were the independent influencing factors to predict the occurrence of acute appendicitis.The consistency index of prediction model of nomogram based on this model was 0.917.Conclusion：The nomogram model based on clinical symptoms and laboratory indexes can effectively predict acute appendicitis.

Key words: acute abdomen, acute appendicitis, rapid scoring system