The five blood tests for infectious diseases include five tests for hepatitis B surface antigen, hepatitis C antigen, hepatitis C antibody, syphilis antibody and AIDS antibody. These five tests are required before clinical blood transfusion and blood donation. Because these infectious diseases can be transmitted through blood and cause infection to healthy people, for example, the five tests for blood infectious diseases are performed on blood recipients before clinical blood transfusion. The purpose is to find out whether the patient was carrying these viruses in his or her body before the transfusion. If the patient carries these viruses in his or her body, it can prove that the patient has developed these infectious diseases that are not transmitted through blood transfusion. Before blood donation, the donor is also tested for the five blood infectious diseases. If any of the tests are positive for antibodies, it means that the donor is carrying the virus in his or her body and is not suitable for blood donation. This is because such blood can cause the transmission of diseases to healthy people.