The purpose of the present study was to determine the cumulative likelihood of pregnancy success after repetitive cycles of oocyte donation and specifically to examine the influence of recipient age and diagnosis upon the cumulative likelihood of pregnancy in an effort to identify any potential subgroup of recipients who might have diminished endometrial receptivity. We retrospectively analysed the outcome of 418 consecutive embryo transfer cycles among 276 recipients of oocyte donation in our institution. We analysed clinical pregnancy and delivery rates in the recipients divided by age groups and diagnostic groups. For the purpose of life-table analysis, only cycles prior to and including the first cycle producing a successful pregnancy were included. Frozen-thawed embryo transfers were not included in the analysis. The overall clinical pregnancy rate was 36.2% (95% CI 31-41%) and the cumulative pregnancy rate after four cycles was 87.9%. The overall delivery rate was 29.3% (95% CI 25-33%) and the cumulative delivery rate after four cycles was 86.1%. There were no statistically significant differences in any of the rates attributable to recipient age or diagnosis. No decline in per cycle success was noted over consecutive cycles. We conclude that neither recipient age nor diagnosis plays a substantial role in the success of oocyte donation, implying that endometrial receptivity is unaltered by age or diagnosis. Furthermore, up to four successive cycles of oocyte donation are associated with the same probability of success.

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Background: The IVF industry has been trying to reduce high order multiple pregnancies by promoting single embryo transfer for nearly two decades. Although improvements in embryo culture practices concurrently occurred, poor prognosis patients and those of advanced maternal age (≥38 years old) proved to be challenging cases when determining the number of embryos to transfer and yet still optimize pregnancy success. It was not until preimplantation genetic screening (PGS) of blastocysts was coupled with conservative embryo transfer decisions that worldwide progress occurred. The objective of this study was to determine the efficacy of single embryo transfer (SET) compared to dual embryo transfer (DET) in older patients (age ≥38) performing vitrified-warmed, euploid ET cycles.