How many embryos to transfer?
The number of embryos transferred is crucial to your risk of a triplet pregnancy or higher. In the United Kingdom, a maximum of three embryos may be replaced per treatment cycle for women aged 40 or over 40 at the time of embryo transfer but for women aged under 40, the maximum is two (HFEA, code of practice, 7th edition. London. 2007). some countries have no restrictions or regulations with regard the number of embryos to be transferred. Recently, there has been a drive toward single embryo transfer (SET). This is already a common practice in many Scandinavian countries. In order to improve the effectiveness of SET, selecting the embryo with the highest potential for implantation is important. Proponents of SET argue that multiple pregnancy rates are virtually eliminated while the livebirth rates are slightly compromised, particularly in younger women aged 35 years or under.
