Abstract: A test module or reagent handling device for use with a clinical analyzer for conducting body serum assays and/or immunoassays; the test module coacting with the analyzer to selectively provide a plurality of liquid dilution and reagent materials to a serum sample, the test module having programmable valve means coacting with a dispense probe to serially: select a serum sample and to deposit said sample and liquid dilution material into a dilution cup or vessel; subsequentially withdraw a portion of the diluted serum from the dilution cup and to dispense said diluted serum portion along with at least one liquid reagent material into a reaction cup or vessel.