ELISA（enzyme linked immunosorbent assay） The ELISA can be used to detect the presence of antigens that are recognized by an antibody, or it can be used to test for antibodies that recognize an antigen. ⚫ Sandwich ELISAELISA（enzyme linked immunosorbent assay） The ELISA can be used to detect the presence of antigens that are recognized by an antibody, or it can be used to test for antibodies that recognize an antigen. ⚫ Sandwich ELISA