Quadruplet pregnancy following transfer of two embryos: Case report.

Following a long period of secondary unexplained infertility, a couple had assisted conception treatment with IVF and transfer of two embryos 2 days later. The woman conceived and was found to have a quadruplet pregnancy. Following spontaneous labour onset at 34 weeks gestation, she was delivered by immediate Caesarean section. All four babies (three boys, one girl) were eventually discharged home with the mother. All the boys were found to be of differing zygosity. The quadruplet pregnancy was attributed to natural conception following intercourse and fertilization of oocytes not collected at the time of IVF. The wisdom of intercourse during a cycle of IVF is discussed.