Controlled ovarian hyperstimulation (COH) parameters associated with euploidy rates in donor oocytes.

Although oocyte donors are young and are expected to provide a high rate of euploid oocytes, significant differences of euploidy rates for donor embryos exist between different IVF centers (1). Laboratory conditions can lead to differences of euploidy (2,3,4,5,6,7); but, the role of COH has not been investigated. In this study, we investigated whether euploidy rates in the embryos created from donor oocytes are influenced by controlled ovarian hyperstimulation parameters used during assisted reproduction.