An electrically-powered automated or semi-automated laboratory instrument intended to be used for the qualitative and/or quantitative simultaneous determination of multiple chemical and/or biological markers in a single clinical specimen using an immunological method which incorporates multiple antibodies arranged on a solid surface (e.g., slide, plate, membrane) or coated to micro-particles. It typically includes a system for the detection of bound target antigen (e.g., chemiluminescent, fluorescent, photometric, magnetic detector), together with sample processing, data processing and data display software.