Embryo loss (also known asembryo death) is the death of anembryo at any stage of itsdevelopment which in humans, is between the second through eighth week after fertilization.[1] Failed development of an embryo often results in the disintegration and assimilation of its tissue in theuterus, known as embryo resorption. Loss during the stages ofprenatal development afterorganogenesis of thefetus generally results in the similar process offetal resorption ormiscarriage.[2] Embryo loss often happens without an awareness ofpregnancy, and an estimated 40 to 60% of all embryos do not survive.[3]
There is considerable debate about the moral status of human embryos. These debates are important in relation to abortion and IVF. Some argue that fetuses have the same moral status as infants, children, and adults.[4] However, critics claim that this view is morally inconsistent due to the frequency of embryo loss/miscarriage/spontaneous abortion in general population.[4] Some say that the debate ignores an important biological feature of human embryos, the fact that most human embryos die, before even doctors know they exist.[5]
Withinfertility clinics embryo loss is associated with a high number ofimplanted embryos.[6] The keeping of embryos in tanks can also increase risks of loss in instances where technical malfunctions can occur.[7]
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