IVF: Whv not twins'?

摘要

What began as a European phenomenon has spread worldwide: defining twins conceived through fertility treatments as adverse outcomes to be avoided. This has led to government interventions in some European countries (and at least one Canadian province) to restrict the number of embryos allowed for transfer during in vitro fertilization (IVF).Although a majority of twin pregnancies following fertility treatments are generated in ovarian hyperstimulation cycles (with or without intrauterine inseminations [IUI]),1 these treatments have paradoxically escaped regulatory attempts by medical organizations and/or governments.