Smoking is prohibited on the first day, so as not to affect intubation when coughing during examination; Smoking can also reduce gastric acid secretion, which is convenient for doctors to observe. Before the examination, the patient should be on an empty stomach for at least 6 hours. If you check in that morning, you should fast after dinner the day before, and breakfast is free that day; If you check in the afternoon, you can eat light semi-liquid food for breakfast and fast at noon. Those who are seriously ill, weak and unable to take care of themselves after fasting should be injected with hypertonic glucose solution intravenously before examination. Fasting is necessary. Gastroscope usually takes about 8 hours, but colonoscopy usually takes 1-2 days to eat too much or food with residues. Colonoscopy should use laxatives to empty the residues in the intestines so as not to affect the inspection quality.

In order to eliminate patients' nervousness, reduce gastric juice secretion and gastric peristalsis, expel gastric foam, and make the image clearer, if necessary, doctors should give patients sedatives, spasmolytics and defoamers 20-30 minutes before examination. In this regard, patients should understand and cooperate. Gastroenteroscopy should be done to prepare for anesthesia, and ECG should be done before anesthesia to understand the patient's heart condition.

In order to make the gastroscope pass through the pharynx smoothly, pharyngeal anesthetic is usually used before gastroscopy. Patients should cooperate with doctors. Before the examination, the patient should urinate and empty his bladder. After entering the examination room, loosen the neckline and belt, take off the dentures and glasses, take the left lateral position, or switch to other positions as needed. After entering the mirror, don't bite the mirror with your teeth to avoid biting the plastic pipe of the mirror body. The body and head can't rotate, so as not to damage the mirror and hurt the internal organs. Patients with removable dentures must take them out to prevent dentures from falling into their mouths, causing unnecessary mucosal damage or suffocation. If there is discomfort, the patient can't bear it for a while, and can signal the operator (doctor or nurse) to take necessary measures.

In the past, the painful reaction of gastroscopy often made patients flinch, afraid of examination and missed the best opportunity for treatment. With the development of medicine, gastroscopy has made great progress. Therefore, once the patient is found to have gastrointestinal diseases, we must actively choose the examination method that suits us, determine the cause and treat the symptoms, so as not to miss the best treatment period and lead to too long treatment time. Do anesthesia gastrointestinal endoscopy to do hepatitis B examination, and immunological examination to prevent cross infection.