Prospective evaluation of two stimulation protocols for low responders who were undergoing in vitro fertilization-embryo transfer.

Objective: To compare two stimulation protocols designed for low responders undergoing IVF.

Design: Randomized, prospective study.

Setting: University hospital IVF unit.

Prospective evaluation of blastocyst stage transfer vs. zygote intrafallopian tube transfer in patients with repeated implantation failure.

Objective: To compare extended culture with blastocyst stage transfer and zygote intrafallopian transfer (ZIFT) in the management of IVF patients with repeated implantation failure.

Design: Prospective, nonrandomized study.

Setting: An IVF unit at a university hospital.