Hospitalization is not necessarily a test for AIDS, but it is a routine item that must be checked before surgery or invasive operations and blood transfusions, because these operations have the potential to transmit blood-borne diseases. In addition, if the patient himself is suffering from AIDS and is tested for AIDS, the nurses and doctors can carry out the corresponding protection, which is a protective measure for the health care workers. In addition, in other departments, HIV testing is not usually done routinely, but there is another case where the doctor thinks that the patient’s disease may be related to HIV, so that HIV testing will be done.