Immunoassay has become essential laboratory technique that can be used to measure concentration of different analytes. Immunoassay systems are thus essentially adopted by virtually all the diagnostic laboratories, academic and research institutes, hospital diagnostic centers and other potential end users. Introduction of multiplex immunoassays has further expanded the applications of immunoassay systems in different industries such as pharmaceutical companies, biotechnology and life science industries, food and beverage industries, environment control measurements etc. Modern immunoassays employ labeling techniques such as enzyme labeled, radiolabelled, chromophore labelled, fluorescence labelled etc. and immunoassay systems are used to detect these labelled analytes qualitatively or quantitatively. Some of the established brands in global immunoassay systems include ADVIA (Siemens), UniCel DxI (Beckman Coulter), IDS-iSYS (Immunodiagnostic Systems Inc.), LUMINEX (Luminex Corporation), Cobas Analyzer (Roche) etc. among others. Companies offering multiplex immunoassay systems are expanding their efficiency of multiplexing which is expected to boost the demand for these devices over time. These established brands are benefited with customer loyalty and high cost of instrument switching.