At present, embryo transfer can be performed successfully in most of the mammalian species. There is a high degree of similarity concerning the reproductive functions in these species. In all species there are strong scientific and also practical reasons for the applications of embryo transfer and the associated techniques which will gain more importance in the future.

The aim of the study was to evaluate if the elective single embryo transfer (eSET) strategy could maintain the delivery rates, with at least one live born child, and at the same time decrease the rate of multiple births. A costeffectiveness analysis was also performed between the elective single embryo transfer (SET) (1+1) and double embryo transfer (DET)(2+0) strategies. Another aim was to inv...

Thanks to assisted reproduction technology (ART) most couples with infertility can be helped today. Since the beginning of ART, however, two major problems have existed. In the first years of IVF more than one embryo was transferred in order to reach acceptable pregnancy rates, but this entails a risk of multiple pregnancy with all its morbidity and mortality due to premature birth. Also, studi...

Purpose The aim of the present prospective study was to investigate the efficacy of hyaluronan (HA) using two different concentrations as embryo transfer media for in vitro fertilization embryo transfer cycles. Methods A total of 169 cycles undergoing fresh embryo transfer on day 2 or 3, 561 cycles undergoing frozen-thawed embryo transfer on day 2 or 3, and 484 cycles of frozen-thawed blastoc...

N umerous publications have investigated the practice of elective single-embryo transfer (eSET) (1–27). Single-embryo transfer after in vitro fertilization (IVF) has been advocated as the only effective means to avoid multiple pregnancy in IVF cycles (28). Elective SET is defined as the transfer of a single embryo at either the cleavage or blastocyst stage of embryo development that is selected...