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A competitive solid-phase immunoassay for the determination of testosterone in serum samples using time-resolved fluorescence is described. The solid phase is a testosterone-3-(O-carboxymethyl)-oxime-ovalbumin conjugate coated to polystyrene microtiter strips. Europium-labelled polyclonal and monoclonal antibodies against testosterone-3-(O-carboxymethyl)-oxime-bovine serum albumin were compared. Their behavior was quite similar although the polyclonal antibody was more sensitive, giving a detection limit of 15 fmol testosterone per assay. Correlation with RIA was very good (r = 0.982 and y = -0.150 + 0.969x).
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