The preoperative tests done before the surgical operation will definitely include the test for AIDS. The hematology of the pre-surgical examination program mainly includes blood test, liver and kidney function, electrolytes, blood sugar, coagulation test, and the immunization ten items. Immunization tests include Hepatitis B, Hepatitis C, Syphilis or AIDS. The significance of checking AIDS antibody is twofold: 1) to exclude whether the patient has a combination of the above mentioned infectious diseases, and if there are infectious diseases, the surgical instruments must be strictly sterilized; 2) to prevent cross-infection, so it is necessary to check the AIDS antibody before the surgical operation.