title: The role of a human chorionic gonadotropin burst in in vitro fertilization.
abstract: RESULTS
  No oocytes were found during four ovum pickups (OPU), despite a satisfactory ovarian response to controlled ovarian hyperstimulation. After the first attempt failed in the fourth case, five eggs were retrieved, fertilized, and cleaved after cycle rescue with hCG.
  
  
  CONCLUSIONS
  Whenever oocytes are not aspirated during OPU due to a lack of hCG administration, the cycle may be rescued if 10,000 IU of hCG is injected immediately and OPU planned for 33-36 hr later.
authors.affiliation: Department of Obstetrics and Gynecology, Chaim Sheba Medical Center, Tel Hashomer, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Shulman
authors.forename: I
authors.initials: I
authors.lastname: Ben-Nun
authors.forename: Y
authors.initials: Y
authors.lastname: Ghetler
authors.forename: M
authors.initials: M
authors.lastname: Yonish
authors.forename: S
authors.initials: S
authors.lastname: Mashiach
mesh_terms: D000328:Adult; D006063:Chorionic Gonadotropin / Q000627:therapeutic use*; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D018587:Oocyte Donation / Q000379:methods*; D009865:Oocytes / Q000187:drug effects / Q000502:physiology*; D010053:Ovary / Q000187:drug effects; D010062:Ovulation Induction; D013997:Time Factors
chemical_list: D006063:Chorionic Gonadotropin