The normal value of CA724 in human serum is <6U/ml. Abnormal elevation of this value can be seen in gastrointestinal inflammation, gastrointestinal tumors or ovarian cancer. CA724, known as gastric cancer antigen in Chinese, is one of the markers for detecting gastric cancer and other gastrointestinal tumors, and is often abnormally elevated in gastrointestinal tumors and ovarian cancer and other malignant tumors. In addition, some gastrointestinal inflammatory diseases, such as chronic gastritis and chronic enteritis, can also cause mild elevation of CA724. Therefore, this indicator is only used as an auxiliary means of screening for tumors, and a definitive diagnosis needs to be made by combining with imaging and pathological biopsy, etc. If a patient has abnormal CA724, it can be used to detect gastric cancer and other gastrointestinal tumors. If CA724 is abnormally elevated, patients should go to gastroenterology or medical oncology in time for additional gastroscopy and biopsy, and then actively carry out appropriate treatment after diagnosis, so as to avoid delaying the condition.