Does physicians' experience influence in vitro fertilization success in patients undergoing controlled ovarian hyperstimulation with GnRH antagonists?

In an attempt to examine whether physicians' experience may influence IVF outcome in patients undergoing GnRH antagonist (GnRH-a) controlled ovarian hyperstimulation (COH) protocols, we studied 273 consecutive patients, with a favorable prognosis a priori, admitted to our IVF unit, of whom 88 conceived. The highest pregnancy rate (PR) (46.5%) was observed in patients achieving, on day of hCG administration, an E₂-to-follicle ratio <100 pg/mL. The timing of hCG administration is crucial in patients undergoing the GnRH-a COH for IVF to optimize success rate.