- The document summarizes research on factors that influence IVF success rates, including the number of oocytes retrieved and progesterone levels. - It finds that retrieving around 15 oocytes optimizes live birth rates, and that recombinant FSH preparations yield more oocytes than other gonadotropins. - While progesterone levels on the day of hCG administration correlate with the number of oocytes, there is no clear evidence that certain progesterone levels negatively impact pregnancy rates, especially with adequate embryos for freezing and future transfers. - Considering cumulative live birth rates from multiple transfer cycles is important to properly assess IVF success rates and outcomes. Optimizing oocyte yield, embryo culture, vitrification techniques, and performing