CA724 is one of the lab markers for digestive tract cancer, which is a non-specific tumor marker, only CA724 is high, you need to exclude the possibility of digestive tract tumor, and you need to perform electronic gastroenteroscopy, CT, ultrasound and other tests to exclude lesions. 1. Electronic gastroenteroscopy: it is the most commonly used means of examination for digestive examination, and is the gold standard for tumor diagnosis, which is clear and definite. Electronic gastroscopy can visualize the lesions in esophagus, stomach and duodenum, and there are two kinds of painless and ordinary examinations, which require fasting and taking local anesthesia drugs orally before the examination; Electronic colonoscopy is divided into colonoscopy and small colonoscopy two, can visualize the large intestine, small intestine lesions, there are painless and ordinary two, according to the individual tolerance level to choose, need to take oral intestinal cleansing drugs before the examination. 2. CT: high degree of acceptance, simple and fast, can initially screen lesions, CA724 high need to carry out chest, abdominal and pelvic CT examination, if necessary, further enhancement. 3. Ultrasound: the combination of examination and CT can prevent the omission of lesions, CA724 high line of liver, gallbladder, pancreas and spleen, intestines, uterine adnexa and so on. It is recommended that patients maintain a good attitude and actively cooperate with the doctor’s examination.