Oocyte donation program: Pregnancy and implantation rates in women of different ages sharing oocytes from single donor

Objective: To investigate the importance of uterus age as regards of pregnancy, implantation, and abortion rates using the oocyte donation model. Design: Retrospective data analysis of cases where recipients of different ages shared oocytes from single donor. Setting: A tertiary infertility center. Patients: One hundred fourteen women (21 to 49 years of age) undergoing a total of 114 cycles of oocyte donation were divided into two groups according to age (group A less than or equal to 39 years; group B between 40 and 49 years). Interventions: Hormonal replacement therapy was given using increasing doses of 17 beta-E(2) (2, 4, and 6 or 8 mg) and either 100 mg of P in oil or 600 mg of micronized P through the vaginal route. Main Outcome Measures: Pregnancy, abortion, and implantation rates. Results: Fifty-seven transfer cycles were performed per age group. Twenty-seven clinical pregnancies were achieved in group A and 14 in group B, with pregnancy rates (PRs) of 47.3% and 24.5%, respectively. There were four abortions in group A and one in group B, resulting in abortion rates of 14.8% and 7%, respectively. Thirty-four of 137 transferred embryos in group A and 20 of 134 in group B implanted, resulting in implantation rates of 24.8% and 14.9%, respectively. Conclusion: This study seems to suggest that there are differences in pregnancy and implantation rates in recipients of different ages because of uterine receptivity. Fertility therefore does not depend merely on oocyte age and quality but also on uterine age.