Immunotechnology explains the basics of immunology with their applications in the usage of antibody – antigen reactions such as precipitation, agglutination, immune and radial diffusion. It also explains various techniques commonly used in medical field such as western blotting, ELISA, RIA, immunohistochemistry, etc. The cellular assays using the principles, various methodology and their applications in medical field has helped various physicians and scientists to understand the reaction as well as mode of treatment