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Natural human embryonic mortality is generally considered to be high. Values of 70% and higher are widely cited. However, it is difficult to determine accurately owing to an absence of direct data quantifying embryo loss between...

early pregnancy loss embryo mortality fecundability human chorionic gonadotrophin

It is generally accepted that natural human embryo mortality during pregnancy is high – losses of 70% and higher from fertilisation to birth are frequently claimed. The first external sign of pregnancy occurs two weeks after...

Hertig early pregnancy loss embryo mortality human chorionic gonadotrophin occult pregnancy pre-implantation embryo loss