The Key Components of Veterinary Diagnostic System are Vet Laboratory, Vet Devices and Veterinary Diagnostic Test Kits. Traditionally, laboratory diagnostics for veterinary pathogens have relied on methods of detecting the pathogen by culture or antibodies, using varied techniques, such as neutralization, Enzyme-linked Immunosorbent Assay (ELISA), agar gel immunodiffusion, and complement fixation. Over the years, veterinarians have incorporated new molecular diagnostic techniques, such as Polymerase Chain Reaction (PCR) and Western blot, as well as improved older techniques by using recombinant antigens, monoclonal antibodies, and synthetic peptides. Despite the routine use of conventional diagnostic assays, new molecular techniques have enabled veterinarians to use new tools for rapid and specific diagnosis of animal disease in real-time. The globalization of trade in animals and animal products is a major driver for the improvement of the analytical and diagnostic quality of tests.