Fluoroimmunoassay of progesterone in human serum or plasma.
We describe a fluoroimmunoassay for progesterone in serum or plasma. The assay involves use of an antiserum to progesterone-11-hemisuccinate and a labeled antigen prepared by linking fluoresceinamine to progesterone-3-carboxymethyloxime by use of a mixed-anhydride procedure. Serum or plasma samples are extracted with hexane. After incubation of a portion of the evaporated extract with antiserum and labeled antigen, antibody-bound and free antigen are separated and the fluorescence of the bound fraction is measured. Separation is effected either by using ammonium sulfate to precipitate liquid-phase antiserum or by using a solid-phase antiserum: antiserum covalently linked to magnetizable cellulose particles, which are separated with a magnet. With either separation technique, analytical recovery, linearity, and precision were acceptable and results compared satisfactorily with those obtained with a conventional radioimmunoassay. The solid-phase assay is more precise and more technically convenient, but the performance of both fluoroimmunoassays was adequate for clinical use in the detection of ovulation.
D005260:Female; D005452:Fluoresceins; D005455:Fluorescent Antibody Technique; D006801:Humans; D008297:Male; D010060:Ovulation; D011374:Progesterone / Q000097:blood*; D011863:Radioimmunoassay / Q000379:methods
D005452:Fluoresceins; C030864:5-aminofluorescein; D011374:Progesterone