The document discusses controlled ovarian stimulation (COS) for in vitro fertilization (IVF). It notes that the number of oocytes retrieved during COS is a key prognostic factor for live birth, and that tests like antral follicle count (AFC) and anti-Müllerian hormone (AMH) can help predict ovarian response. The goal of COS is to optimize oocyte yield while avoiding over-response and risks like ovarian hyperstimulation syndrome (OHSS). Personalizing regimens based on individual factors like age and ovarian reserve tests may improve outcomes.