Artificial endometrial preparation for oocyte donation using synthetic estrogen and progestogen.

OBJECTIVE: To evaluate the outcome of an oocyte donation program using synthetic estrogen and progestational agents for uterine preparation. METHODS: Conjugated estrogen, 1.25 mg per day at increasing doses and dydrogesterone, a synthetic progestogen, 30 mg per day were used for uterine priming. All embryo transfers were done on day 2 of progestogen supplementation. RESULTS: The pregnancy rates were 38% per embryo transfer. The ongoing pregnancy rate was 31% with an abortion rate of 20%. CONCLUSION: Endometrial preparation in an oocyte donation program using orally administered synthetic estrogen and progestogen gives pregnancy rates comparable to those reported with natural products.