Prausnitz-Küstner reaction Praus·nitz-Küst·ner reaction (prous'nĭts-küst'nər)
n.
A reaction based on passive transfer of allergic sensitivity in which serum from an allergic individual is injected into cutaneous sites on a normal individual and the injected sites are then exposed to antigens to which the donor is allergic; the cutaneous sites show a characteristic wheal-and-flare reaction.