title: Ultrasonographic-guided embryo transfer does not enhance pregnancy rates compared with embryo transfer based on previous uterine length measurement.
abstract: OBJECTIVE
  To compare pregnancy rates (PRs) after ultrasound-guided embryo transfer and embryo transfer based on ultrasonographic length measurement.
  
  
  METHODS
  Prospective intervention group combined with retrospective control group.
  
  
  METHODS
  University fertility clinic.
  
  
  METHODS
  Patients undergoing IVF and intracytoplasmic sperm injection.
  
  
  METHODS
  Transabdominal ultrasonographic guidance at embryo transfer.
  
  
  METHODS
  Pregnancy and implantation rates.
  
  
  RESULTS
  In 367 ultrasound-guided embryo transfers clinical PR, ongoing PR, and implantation rate were 35.1%, 31.1%, and 24.3%, respectively. In 363 embryo transfers based on previous ultrasonographic length measurement, the rates were 33.9%, 29.5%, and 24.2%, respectively. There were no statistical significant differences between the groups.
  
  
  CONCLUSIONS
  Ultrasonographic guidance does not show any benefit in terms of PR and implantation rate compared to previous ultrasonographic length measurement, an other precise and atraumatic transfer technique.
authors.affiliation: Department of Obstetrics, Gynecology and Reproductive Medicine, Free University Medical Center (VUmc), Amsterdam, The Netherlands. mj.lambers@vumc.nl
authors.forename: Marieke J
authors.initials: MJ
authors.lastname: Lambers
authors.forename: Erbil
authors.initials: E
authors.lastname: Dogan
authors.forename: Hanna
authors.initials: H
authors.lastname: Kostelijk
authors.forename: Jan Willem
authors.initials: JW
authors.lastname: Lens
authors.forename: Roel
authors.initials: R
authors.lastname: Schats
authors.forename: Peter G A
authors.initials: PG
authors.lastname: Hompes
mesh_terms: D000328:Adult; D004624:Embryo Transfer; D004622:Embryo, Mammalian / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D011247:Pregnancy; D018873:Pregnancy Rate; D012189:Retrospective Studies; D014463:Ultrasonography / Q000379:methods*; D014599:Uterus / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*