title: Successful pregnancy rates achieved with day 4 embryo transfers.
abstract: OBJECTIVE
  To assess the success of day 4 embryo transfers (ETs) following IVF at one institution.
  
  
  METHODS
  Retrospective analysis.
  
  
  METHODS
  A university hospital IVF program.
  
  
  METHODS
  Two hundred nondonor, fresh IVF cycles.
  
  
  METHODS
  None.
  
  
  METHODS
  Outcomes of IVF. Outcome assessments after day 4 ETs included rates of implantation, clinical pregnancy, and singleton and multiple live births.
  
  
  RESULTS
  The overall live-birth rate was 54.4%. Implantation rates were highest in younger age groups, and similar in patients 35-40 years of age. Pregnancy and live-birth rates were similar across all age groups up to age 40 years. Multiple gestations were highest in women < or =40 years of age.
  
  
  CONCLUSIONS
  Acceptable pregnancy rates can be achieved with day 4 ETs.
authors.affiliation: Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, St. Luke's-Roosevelt Hospital Center, Columbia University College of Physicians and Surgeons, New York, New York 10019, USA. josh_skorupski@hotmail.com
authors.forename: Josh C
authors.initials: JC
authors.lastname: Skorupski
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Stein
authors.forename: Uchenna
authors.initials: U
authors.lastname: Acholonu
authors.forename: Heather
authors.initials: H
authors.lastname: Field
authors.forename: Martin
authors.initials: M
authors.lastname: Keltz
mesh_terms: D000328:Adult; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D011247:Pregnancy; D018873:Pregnancy Rate; D019836:Preimplantation Diagnosis; D012189:Retrospective Studies