title: Altering the timing of human chorionic gonadotropin injection according to serum progesterone (P) concentrations improves embryo quality in cycles with subtle P rise.
abstract: OBJECTIVE
  To investigate the effect of earlier administration of hCG according to serum concentrations of P on the outcome of IVF-ET in cycles in which a subtle rise in serum P (1.0 to 2.0 ng/mL; conversion factor to SI unit, 3.180) occurred during the follicular phase.
  
  
  METHODS
  Retrospective study.
  
  
  METHODS
  A total of 110 infertile women underwent 124 cycles of IVF-ET at Tottori University Hospital.
  
  
  METHODS
  Serum was obtained daily or every 12 hours from day 7 until the administration of hCG. Serum E2 and P concentrations were measured by RIA. In 19 of 36 subtle P rise cycles, hCG injection was given when the levels of serum P exceeded 1.0 ng/mL ("rescued" subtle P rise). Parameters of IVF outcomes for the no P rise, the subtle P rise, and the rescued subtle P rise cycles were compared.
  
  
  RESULTS
  The mean day of hCG administration in the rescued cycles was 1 day earlier than those of the subtle P rise and no P rise cycles. The mean number of oocytes collected was significantly higher in the subtle P rise and rescued P rise cycles than in the no P rise cycles. The mean follicular diameter on the day of hCG administration was 13.9 mm in the rescued cycles, significantly smaller than those of the no P rise and subtle P rise cycles. However, there was no significant difference in the cleavage rates between the three groups. The rate of embryonic development beyond four-cell stage was increased significantly in the rescued cycles and no P rise cycles versus the subtle P rise cycles. Embryos obtained in the no P rise and rescued cycles were of better morphological quality than those obtained in the P rise cycles. The implantation rate was significantly higher in the rescued cycles than in the P rise cycles.
  
  
  CONCLUSIONS
  The data suggest that, if hCG is administered when a subtle P rise is detected, embryo quality and subsequent implantation rate can be improved.
authors.affiliation: Department of Obstetrics and Gynecology, Tottori University School of Medicine, Yonago, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Harada
authors.forename: C
authors.initials: C
authors.lastname: Katagiri
authors.forename: N
authors.initials: N
authors.lastname: Takao
authors.forename: T
authors.initials: T
authors.lastname: Toda
authors.forename: Y
authors.initials: Y
authors.lastname: Mio
authors.forename: N
authors.initials: N
authors.lastname: Terakawa
mesh_terms: D000328:Adult; D006063:Chorionic Gonadotropin / Q000008:administration & dosage* / Q000627:therapeutic use; D004622:Embryo, Mammalian / Q000502:physiology*; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D007267:Injections; D009994:Osmolar Concentration; D011247:Pregnancy; D018873:Pregnancy Rate; D011374:Progesterone / Q000097:blood*; D012189:Retrospective Studies
chemical_list: D006063:Chorionic Gonadotropin; D011374:Progesterone