title: Frozen embryo transfer outcome according to reason for freezing the embryos.
abstract: OBJECTIVE
  To determine if cryopreservation influences pregnancy outcome following transfer.
  
  
  METHODS
  Retrospective cohort analyses of frozen embryo transfer (ET) cycles divided into five different categories according to reason for freezing.
  
  
  RESULTS
  Frozen embryos remaining as a result of failing to conceive with the previous fresh transfer or those remaining because of cancellation of fresh ET related to inadequate endometrial thickness, result in lower pregnancy rates (PRs).
  
  
  CONCLUSIONS
  The fact that embryos never deselected in a group whose fresh ET was canceled because of risk of ovarian hyperstimulation did not have the best results suggests that these oocytes may not be of equal quality to those attained with a more modest response.
authors.affiliation: The University of Medicine and Dentistry of New Jersey Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center, Department of Obstetrics and Gynecology, USA.
authors.forename: D
authors.initials: D
authors.lastname: Horwath
authors.forename: J H
authors.initials: JH
authors.lastname: Check
authors.forename: J K
authors.initials: JK
authors.lastname: Choe
authors.forename: C
authors.initials: C
authors.lastname: Wilson
authors.forename: J
authors.initials: J
authors.lastname: Amui
mesh_terms: D000022:Abortion, Spontaneous / Q000453:epidemiology; D000328:Adult; D015331:Cohort Studies; D015925:Cryopreservation; D004624:Embryo Transfer; D004717:Endometrium / Q000000981:diagnostic imaging; D005260:Female; D005306:Fertilization; D006801:Humans; D016471:Ovarian Hyperstimulation Syndrome / Q000453:epidemiology; D011247:Pregnancy; D018873:Pregnancy Rate; D012189:Retrospective Studies; D014463:Ultrasonography