[Comparative analysis of pregnancy rate/captured oocytes in an in vitro fertilization program].

Background: Since in vitro fertilization/embryo transfer is used as a common assisted reproductive technique there have been attempts to increase its success rate. One way is to obtain more good quality mature ovules to fertilize them, and two to three good quality embryos to transfer.

Objective: To determine if the number of retrieved oocytes is related with the pregnancy rate in IVF-ET.

Patients And Methods: Reproductive and descriptive study; 172 patients in the IVF program were included. Whole patients had ovary stimulation with FSHr and antagonist multidose protocol. Five study groups were considered depending on the oocyte number retrieved. Data were analized and correlated with fertilization and pregnancy rate.

Results: There were no statistical differences among age, body mass index, percentage of mature oocyte, fertilization rate, embryo cell stage or basal levels of LH and Estradiol. Group three showed the highest pregnancy rate (64.29%) nevertheless group five had major number of embryo transferred (2.97 +/- 0.54 vs 3.17 +/- 0.45, p = 0.21). According to FSH doses given, group one had statistical difference related to group three, with higher dose (54.1 vs 62.1). According to previous studies, related to the number of oocyte retrieved, the possibility of pregnancy is higher with more than 13 oocytes retrieved (OR: 0.9 IC 95%: 0.4 -1.7).

Conclusions: Pregnancy rate is higher when ten to fifteen oocytes were retrieved.