When a person undergoes an operation, he or she will undergo routine tests such as blood test, coagulation function, etc. Special operations also require some special tests. People in surgery will first do blood routine, blood type, coagulation function, liver and kidney function, blood pressure, blood sugar, blood lipids, tumor markers, Hepatitis B five, Hepatitis C, anti-HIV, syphilis, electrocardiogram, chest orthopantomograms and other routine checks. In addition, some special surgeries also need to do some special tests, such as eye surgery, but also to improve the visual acuity, intraocular pressure, anterior segment of the eye, fundus examination, gastrointestinal surgery needs to improve the gastroscope, enteroscopy examination and so on. Improving these preoperative examinations will help the doctor fully understand the patient’s basic physical condition and determine whether the patient can tolerate the surgery, as well as to avoid some unnecessary risks during the surgery. Keep a good attitude and communicate with your doctor if you have any questions or discomfort.