title: Sonography: dizygotic twin survival in early pregnancy.
abstract: It has been suggested that losses of twin conceptuses in very early pregnancy are high, and that for every liveborn twin pair there are a further 10-12 twin pregnancies that end up as a singleton birth. Here we show that in a group of women who had double-ovulated and conceived, the probability of the second egg also becoming fertilized and developing is 20-30% - which is comparable to the probability of conception and survival of a single conceptus. We conclude that the presence of one embryo does not affect the development of its twin.
authors.affiliation: Department of Obstetrics and Gynaecology, Monash University, Monash Medical Centre, Clayton, Victoria 3168, Australia.
authors.forename: Stephen
authors.initials: S
authors.lastname: Tong
authors.forename: Simon
authors.initials: S
authors.lastname: Meagher
authors.forename: Beverley
authors.initials: B
authors.lastname: Vollenhoven
mesh_terms: D020964:Embryo Loss / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000401:mortality; D005260:Female; D006801:Humans; D008954:Models, Biological; D010061:Ovulation Detection; D011247:Pregnancy / Q000502:physiology*; D015996:Survival Rate; D014429:Twins, Dizygotic / Q000706:statistics & numerical data*; D018608:Ultrasonography, Doppler