The art and science of embryo transfer: What information are we lacking?

Embryo transfer (ET) is one of the critical points during the in vitro fertilization (IVF) cycle, since implantation remains to be the rate-limiting step in the success of IVF.Placement of the embryo(s) into the uterine cavity using a suboptimal technique may risk all the physical, emotional and financial investments made up to that point.There are established factors that determine the outcome after ET, as well as controversial ones (1).We will address each of these factors listed in Table 1 individually.

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