Longer ovarian stimulation reduces embryo number and clinical pregnancy rate in long GnRH agonist cycles.

Background: The aim of this study was to analyze whether the length of controlled ovarian stimulation affects in vitro fertilization (IVF) cycle outcomes.

Methods: This retrospective cohort study was performed at a private, university-affiliated fertility centre. We reviewed 1522 IVF cycles, comprising 979 long gonadotropin-releasing hormone (GnRH) agonist and 543 GnRH antagonist protocols.

Research implications of embryo cryopreservation choices made by patients undergoing in vitro fertilization.

In 782 cryopreservation cases over 11 years, 60% of patients personally used their embryos, 26% kept their embryos in storage, 8% discarded their embryos, 5% gave them to research, and 1% anonymously donated them to other couples.