Currently, there are no mandatory blood tests before scaling in China, but specific blood tests before scaling can be more helpful. The normal blood tests that can be performed before scaling include routine blood tests, coagulation function and infectious diseases. The general blood test is to check the patient’s basic condition, whether the white blood cells are low or high, whether the patient has anemia or whether the patient has especially low platelets, which may have some effect on the scaling. It also needs to be combined with coagulation function, if the coagulation function is particularly poor, there may be excessive bleeding during or after the procedure. This can be avoided if blood tests are performed for routine blood and coagulation functions prior to the scaling. It is also important to check for infectious diseases, such as hepatitis B, AIDS, syphilis, etc., before scaling. At the same time, the disinfection time for scaling instruments should be stricter for specific infected viruses.