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Excess concepti compared with number of embryos transferred in in vitro fertilization
Author(s) -
Tan S. L.,
Curson R.,
El Hussein E.,
Rainsbury P.,
Parsons J.
Publication year - 1993
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1046/j.1469-0705.1993.03020134.x
Subject(s) - medicine , human fertilization , embryo , in vitro fertilisation , andrology , in vitro , anatomy , microbiology and biotechnology , genetics , biology
To reduce the risk of multiple pregnancy, most in vitro fertilization programs limit the number of embryos transferred; because monozygotic twinning may occur, it is possible that more concepti are produced than the number of embryos transferred. To quantify the prevalence of this phenomenon, 1820 clinical pregnancies generated from 11 601 in vitro fertilization treatment cycles were reviewed. Two patients conceived four fetuses each after having had three embryos transferred, while one conceived three fetuses after having had two embryos transferred. The overall prevalence rate was, therefore, one in 607 cases. The obstetric details of these three pregnancies are reported. Copyright © 1993 International Society of Ultrasound in Obstetrics and Gynecology