Immunoassays is the first practical volume designed to help any biolog ist develop an immunoassay of any common format for any suitable analy te. The basic principles are described and the choices of assay types and formats listed. Methods for raising and for characterizing antibod ies, for preparing radioactive, enzymatic, fluorescent and other label s, are described. Solid-phase reagents, standards and immunogens are e xplained, with procedures for their preparation.