Do not want to do colonoscopy can also be done through other laboratory tests and imaging examinations, including CT, X-ray barium enema, blood routine, tumor markers, stool testing and finger examination to determine whether there are abnormalities in the intestine. However, colonoscopy is the standard of examination for certain diseases, such as polyps and tumors, so it is still necessary to do colonoscopy when necessary: I. Laboratory tests: 1. Blood routine: rising white blood cells, neutrophils, eosinophils, etc. indicate the presence of infectious diseases, commonly in the intestinal inflammatory response or malignant tumors. In addition, if there is long-term blood in the stool, the red blood cell count, hemoglobin and other related indicators may decrease; 2. Stool testing: In pathological cases, blood, pus, parasites and their eggs, encapsulation, pathogenic bacteria, etc. are visible in the stool. It is of great value to understand whether there are lesions in the intestinal tract and indirectly judge the functional status of the digestive system; 3. Tumor marker detection: tumor markers exist in blood, cells, tissues or body fluids, which can reflect the existence and growth of tumors and have certain value for the diagnosis, efficacy and recurrence detection of tumors. The common markers for diagnosing intestinal tumor are CA19-9, CA242 and so on. Imaging examination: 1.Barium enema X-ray: because the intestine is a cavity organ, barium sulfate contrast is mostly chosen for examination, which is not easily penetrated by X-ray and can clearly outline the structural details to achieve the purpose of disease detection and diagnosis; 2.CT abdomen: it can clearly show the intestinal wall thickening, mass and abnormal reinforcement caused by intestinal diseases, as well as extra-mural invasion, and also observe the position of intestinal canal and the presence of stenosis and dilatation. It can also observe the location of the intestinal canal and the presence or absence of stenosis and dilatation. It has been widely used for the examination of neoplastic, inflammatory, obstructive and ischemic diseases; 3, MRI examination: At present, the clinical application of MRI examination of intestinal diseases is not as good as CT, but it has high value for the examination of inflammatory lesions and tumor staging in some parts. Palpation: 1, abdominal palpation: the doctor gently presses on the patient’s abdomen, and through the feedback of touch, based on clinical experience, a preliminary judgment can be made on some intestinal occupational lesions, appendicitis, intestinal obstruction, etc., combined with clinical symptoms; 2, rectal finger examination: the doctor’s back hand shows the finger wearing a finger sleeve, and enters the anus after sufficient lubrication to check whether there is pressure pain and smooth mucosa in the rectal wall, and whether there are masses and fluctuations The doctor will check the rectal wall for pressure and smoothness of the mucosa, and for lumps and fluctuations.