Definition: Fluoroimmunoassay where detection of the hapten-antibody reaction is based on measurement of the increased polarization of fluorescence-labeled hapten when it is combined with antibody. The assay is very useful for the measurement of small haptenic antigens such as drugs at low concentrations.
NIM; application of fluorescence polarization to hapten-antibody reaction: do not confuse with FLUORESCENCE POLARIZATION, determ of polarization of fluorescent light; DF: FPIA