ABSTRACT
Despite major advances in assisted reproduction technology (ART), the implantation rates remain too low to allow the widespread use of single-embryo transfer. Successful implantation requires a viable embryo, a receptive endometrium, and an optimal embryo transfer (ET) technique. Various in vitro fertilization (IVF) steps proceed successfully up to the ET stage in about 80% of cases (1). However, only a small percentage of them achieve pregnancy. There are numerous technical aspects that aff ct the ET results. The variables in IVF are so numerous that it is difficult to fix all other factors while studying only one other factor (2). Unfortunately, most clinicians consider the ET technique to be a simple procedure. To them, it is only a simple task of inserting the ET catheter into the uterine cavity and delivering the embryos. However, it is not as simple as it appears, and it is easier said than done (3).
