title: Cumulative pregnancy rates after four embryo transfers of either fresh or frozen embryos.
abstract: OBJECTIVE
  To evaluate in the modern era of in vitro fertilization (IVF) cumulative probability of pregnancy for the first four embryo transfers (ET) irrespective of whether the embryos were fresh or frozen.
  
  
  METHODS
  Retrospective review over a 2 1/2 year period. Cumulative probability of pregnancy for four consecutive cycles of either fresh or frozen ETs divided into four age groups.
  
  
  RESULTS
  The cumulative clinical and viable pregnancy rates after four ETs were 92% and 88%; 87% and 82%; 83% and 69%; and 68% and 52% for age groups <30, 30-34, 35-39, and 40-44. The cumulative rates decline with age.
  
  
  CONCLUSIONS
  Pregnancy rates per transfer for the first four ETs regardless of age are similar even in IVF centers that emphasize frozen ETs.
authors.affiliation: The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, USA.
authors.forename: D
authors.initials: D
authors.lastname: Lurie
authors.forename: J H
authors.initials: JH
authors.lastname: Check
authors.forename: A
authors.initials: A
authors.lastname: Nazari
authors.forename: J K
authors.initials: JK
authors.lastname: Choe
authors.forename: G
authors.initials: G
authors.lastname: Lee
mesh_terms: D000328:Adult; D015925:Cryopreservation; D004624:Embryo Transfer; D005260:Female; D006801:Humans; D015993:Life Tables; D011247:Pregnancy; D011256:Pregnancy Outcome; D018873:Pregnancy Rate; D012189:Retrospective Studies