Pregnancy rates in sequential in vitro fertilization cycles by oocyte donors

Objective: To evaluate the clinical outcome of in vitro fertilization (IVF) treatment cycles from individual oocyte donors who underwent multiple sequential donations. Methods: We reviewed clinical outcome data from sequential anonymous oocyte donation cycles using donors who underwent multiple IVF stimulations. Donors were grouped by the interval between cycles and the cycle number (rank). The primary outcome measure was delivery rate by individual donor per retrieval from the combined derivative fresh and frozen embryo transfers. Results: Duration and amount of gonadotropin therapy and the fertilization rates did not correlate significantly with the interval between cycles or cycle rank. Cumulative delivered pregnancy rates for cycles 1–6 were 51.5%, 54.6%, 50.5%, 51.5%, 51.1%, and 57.6%, respectively. Delivered pregnancy rates did not vary by interval between cycles. Conclusion: Young healthy presumed or proven fertile women can reliably donate oocytes for at least six cycles with the expectation of consistently high pregnancy rates.