La biologie de la reproduction a consid~rablement ~volu~ depuis ces derni~res ann~es grace dune meilleure connaissance de la physiologie et aux progr&s techniques r~alis~s. L'exploration endocrinienne de l'infertilit6 tant f~minine que masculine joue un rSle d6cisif dans le diagnostic 6tiologique permettant de proposer au couple sterile l'acc~s d la PMA. Les dosages hormonaux au cours de la stimulation ovarienne sont indissociables des donn~es ~chographiques et de l'efficacit~ th~rapeutique. Enfin, le r~sultat du dosage de I'hCG aprds le replacement embryonnaire sera le crit~re le plus pr6coce d'une grossesse d6butante.
MOTS-CL~:S procreation m~dicalement assist~e (PMA) -stimulation ovarienne.
The biology of reproduction has developed considerably over the last few years thanks to a better knowledge of physiology and to the technical progress that has been accomplished. Endocrine exploration of both feminine and masculine infertility plays a decisive role in the etiologic diagnosis which will enable the practioner to suggest recourse to MAR. Hormonal dosage during ovarian stimulation cannot be dissociated from echographical data and therapeutic efficiency. Finally, the result of hCG after embryon transfert will be the earliest criterion of an incipient pregnancy.