70%胚胎在著床前後或懷孕早期萎縮流產

高達70%胚胎在著床前後或懷孕早期萎縮流產
胚胎受孕形成後約有30%在著床前萎縮，30%在著床後萎縮，10%在懷孕後流產，最後約30%順利活產

http://molehr.oxfordjournals.org/content/16/12/886.full


In addition to subfertility, the incidence of embryo wastage and pregnancy loss is also extraordinarily high in humans, estimated to be 30% prior to implantation (preimplantation loss), a further 30% before 6 weeks gestation (early pregnancy loss or EPL) and 10% of clinical pregnancies, mostly prior to 12 weeks gestation (Chard, 1991; Macklon et al., 2002) 

Figure 1

The embryo wastage iceberg in fertile and superfertile women. The embryo wastage icebergs give an overview of the outcome of conceptions in a normal fertile population and a specific subset of a superfertile population, representing 3% of all couples. The ‘sea-level’ in the figure distinguishes the pregnancies lost prior to the time of the missed menstrual period and clinically recognized pregnancy losses.