microcytotoxicity test

noun

mi·​cro·​cy·​to·​tox·​ic·​i·​ty test -ˌsīt-ō-ˌtäk-ˈsis-ət-ē- 

: a procedure using microscopic quantities of materials (as complement and lymphocytes in cell-mediated immunity) to determine cytotoxicity (as to cancer cells or cells of transplanted tissue)

called also microcytotoxicity assay