[Quantitation of plasma 17-beta estradiol using an immunoenzyme method. Comparison with a specific radioimmunoassay]

Estradiol-17 beta (E2) was assayed on plasma samples with an enzyme immunoassay kit and results were compared with values obtained from a specific radioimmunoassay. An overall and specimen-dependent underestimation is found, confirmed by cold E2 recovery experiments. Such a kit is not entirely reliable in ovulation induction monitoring, specially for definition of hCG administration timing.