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Delaying the initiation of progesterone supplementation until the day of fertilization does not compromise cycle outcome in patients receiving donated oocytes: a randomized study.

Escribá MJ, Bellver J, Bosch E, Sánchez M, Pellicer A, Remohí J

Universitary Institute IVI Valencia, Valencia, Spain. mjescriba@ivi.es

OBJECTIVE: To determine whether the initiation of P supplementation as artificial luteal phase support (day -1, day 0, or day +1 of egg donation) in extensive programs of ovum donation influences cycle cancellation, pregnancy outcome, and implantation rate in day 3 embryo transfers. DESIGN: Prospective randomized trial. SETTING: Oocyte donation program at the Instituto Valenciano de Infertilidad, Valencia, Spain. PATIENT(S): Three hundred recipients with normal ovarian function, absence of uterine anomalies, and undergoing their first egg donation were recruited between September 2003 and September 2004. INTERVENTION(S): A computer-based randomization divided the recipients into three groups when hCG was administered to their matched donors. The first group (group A) started P supplementation the day before oocyte retrieval; the second group (group B) started P supplementation on the day of the oocyte retrieval; and the third group (group C) started P supplementation 1 day after the egg retrieval once fertilization was confirmed. MAIN OUTCOME MEASURE(S): Implantation, pregnancy, and ongoing pregnancy rates were the primary outcome measures considered. The secondary outcome measure was the cancellation rate, especially due to fertilization failure. RESULT(S): Global cancellation rate and cancellation rate due to fertilization failure were significantly higher in group A (12.4% and 8.2%, respectively) than in group C (3.3% and 0%, respectively). Reproductive outcome was similar in all the groups except for a higher biochemical pregnancy rate in group A (12.9%) than in groups B (6.6%) and C (2.3%). CONCLUSION(S): Initiation of P on day +1 of embryo development decreases cancellation rates of day 3 embryo transfers in extensive programs of ovum donation without any deleterious effect on pregnancy outcome or implantation rate.

Published 4 July 2006 in Fertil Steril, 86(1): 92-7.
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