Human pregnancy following cryopreservation, thawing and transfer of an eight-cell embryo

The widespread use of clomiphene citrate and exogenous gonadotrophins for in vitro fertilization (IVF) in humans1,2 frequently results in the production of multiple embryos. Replacement of more than two embryos increases pregnancy rate3 but may result in multiple pregnancies with increased pre- and post-natal abnormality. Preservation of embryos for a… CONTINUE READING