The effect of transferring pronuclear embryos on pregnancy outcome after in vitro fertilization.
In a prospective clinical trial the pregnancy rate in patients matched for infertility status, degree of hyperstimulation, and number of oocytes recovered was unaffected by whether embryos were transferred while still pronuclear (day 1) or after they had undergone cleavage (day 2). The pregnancy rates per transfer were 27% and 22%, respectively, for the two transfer times. Unlike results of a previous study, no difference was detected in the outcome of pregnancies from the two groups.
Warnes
G M
GM
Queen Elizabeth Hospital, University of Adelaide, Woodville, South Australia.
Quinn
P
P
Kirby
C A
CA
Broom
T J
TJ
Kerin
J F
JF
D002455:Cell Division; D002986:Clinical Trials as Topic; D004624:Embryo Transfer; D004622:Embryo, Mammalian / Q000166:cytology*; D004958:Estradiol / Q000097:blood; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D010062:Ovulation Induction; D011247:Pregnancy; D011256:Pregnancy Outcome; D011374:Progesterone / Q000097:blood; D011446:Prospective Studies
D011374:Progesterone; D004958:Estradiol