Oocyte Cryopreservation Registry (HOPE Registry)

Inclusion Criteria: * Must be in an ART program * Donor and recipients must be of reproductive age (18-50 years old, inclusive at the time of oocyte freezing and/or thawing) who intend to achieve a pregnancy by utilizing frozen thawed autologous or heterologous oocytes * Female and partner (if applicable) must voluntarily provide written informed consent/HIPAA authorization prior to any Registry-related data collection * Female and partner (if applicable) must be willing to provide a second written informed consent following each live birth prior to any Registry- related data collection on birth characteristics and twelve (12) month evaluation of offspring * Children born from women who take part in this registry from birth to 12 months (+/- 1 month) of age Exclusion Criteria: * Have clinically significant systemic disease * Have abnormal, undiagnosed gynecological bleeding * Have any contraindication to Controlled Ovarian Stimulation (COS) for ART and to gonadotropins to be used in ART * Also, in a rare situation, are undergoing ET with mixed embryos generated from fresh oocytes produced in the current cycle as well as frozen embryos generated from nonfrozen oocytes obtained in a previous ART cycle * Children born from women who do not take part in this Registry * Any offspring of woman who are not Registry subjects cannot take part in this registry