title: Clinical experience with recombinant follicle-stimulating hormone (FSH) and urinary FSH: a retrospective case- controlled analysis.
abstract: OBJECTIVE
  To compare the efficacy and efficiency of recombinant FSH (rFSH) and urinary FSH (uFSH).
  
  
  METHODS
  Retrospective case controlled analysis.
  
  
  METHODS
  An assisted reproduction unit at a university center.
  
  
  METHODS
  1388 patients undergoing long protocol in vitro fertilization/embryo transfer (IVF-ET) using buserelin acetate from day 2 of the cycle and either rFSH (follitropin beta) (n = 694) or uFSH (n = 694) with equal number of ampules started (rFSH: 50 IU, uFSH: 75 IU).
  
  
  METHODS
  Patients were included in the two groups of treatment after matching for similarity in age and type of treatment (IVF or intracytoplasmic sperm injection).
  
  
  METHODS
  Total dose of FSH, ovarian response, and IVF outcome.
  
  
  RESULTS
  Patients who received uFSH experienced a shorter period of stimulation, and a higher number of oocytes were collected. The total FSH used was lower in the rFSH group, and they required a lower FSH dose per oocyte retrieved. The implantation and pregnancy rates were similar between the uFSH and rFSH groups. In both groups implantation and pregnancy rates were higher when intracytoplasmic sperm injection was performed as compared with IVF.
  
  
  CONCLUSIONS
  The implantation and pregnancy rates are similar when either rFSH or uFSH is used (when compared on an ampule-to-ampule basis, rFSH: 50 IU, and uFSH: 75 IU). However, a significantly lower total FSH dose was used in the rFSH group with a lower FSH dose per oocyte collected.
authors.affiliation: Department of Reproductive Medicine and Science, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom. aravhon@bezeqint.net
authors.forename: A
authors.initials: A
authors.lastname: Ravhon
authors.forename: S
authors.initials: S
authors.lastname: Lavery
authors.forename: R
authors.initials: R
authors.lastname: Aurell
authors.forename: G
authors.initials: G
authors.lastname: Trew
authors.forename: R
authors.initials: R
authors.lastname: Margara
authors.forename: R
authors.initials: R
authors.lastname: Winston
mesh_terms: D000328:Adult; D000367:Age Factors; D016022:Case-Control Studies; D004624:Embryo Transfer; D004958:Estradiol / Q000097:blood; D005260:Female; D005307:Fertilization in Vitro; D005640:Follicle Stimulating Hormone / Q000008:administration & dosage / Q000494:pharmacology* / Q000652:urine; D006801:Humans; D006080:Ovarian Follicle / Q000502:physiology; D010062:Ovulation Induction / Q000379:methods*; D011247:Pregnancy; D011994:Recombinant Proteins / Q000008:administration & dosage / Q000494:pharmacology; D012189:Retrospective Studies; D020554:Sperm Injections, Intracytoplasmic
chemical_list: D011994:Recombinant Proteins; D004958:Estradiol; D005640:Follicle Stimulating Hormone