Even when no choice of embryos exists the multiple pregnancy risk is high!

Abstract

OBJECTIVE: Elective routine transfer of two embryos is still the norm, with the exemption of a few countries where law dictates otherwise. As a consequence, multiple pregnancy rates are still very high. When selection is possible only the best 2 embryos are transferred, the rest frozen. Yet, when only 2 embryos are available is the risk of multiple pregnancy still high? This clinical question has not received a definite answer to date. We set to ascertain the risk of twins and what should the embryo transfer policy be when only 2 embryos are available and none to freeze.