Abstract: A kit for use in an immunoassay testing device that detects a binding reaction between a pair of first and second substances, particularly biogenic substances, which specifically bind together allowing deposition of electrically conductive particles which fully or partially completing an essentially open electrical circuit. More particularly, the kit provides self contained reagent and testing packages that are less contaminant prone and subject to minimal waste. The kit has a self contained reagent package and a test cartridge that are accessible by the testing device. The reagent package has cavities for reagents and diluting fluids. The test cartridge has a cavity for the test specimen and circuitry that is closed upon deposition of electrically conductive particles following the binding reaction.