This ELISA (enzyme-linked immunosorbent assay) kit is produced for the quantitative determination of human anti-mouse IgG antibody (HAMA) levels in patient serum or plasma samples. It detects both HAMA-IgG and HAMA-IgM subtypes. The test might be used as an aid for detection of patients with positive HAMA that may affect prescribed diagnosis and treatment involving monoclonal murine IgG.