title: Association of serum estradiol levels on the day of hCG administration with pregnancy rates and embryo scores in fresh ICSI/ET cycles down regulated with either GnRH agonists or GnRH antagonists.
abstract: OBJECTIVE
  To investigate the interrelation between serum E2 level on hCG day, score of transferred embryos and pregnancy achievement.
  
  
  METHODS
  Records of 350 women aged 18-40 years who underwent ovarian hyperstimulation in fresh cycles down regulated either with GnRH agonist (n = 70) or GnRH antagonist (n = 280) followed by oocyte pick-up, ICSI and embryo transfer are retrospectively analyzed.
  
  
  RESULTS
  Median E2 levels on hCG day of cycles ending with and without pregnancy were similar (p = 0.308). ROC curve for AUC of E2 on hCG day with dependent variable pregnancy rate also demonstrated that the E2 level on hCG day cannot be used to predict pregnancy in IVF/ICSI cycles (AUC 0.532, 95 % confidence interval: 0.471-0.593). Grouping cycles according to their E2 levels on hCG day also did not demonstrate any detrimental effect of either low or high E2 levels on hCG day both in agonist and antagonist cycles. Pregnancy rates are strongly correlated with mean and total score of transferred embryos. Interrelation of E2 on hCG day and pregnancy rate is independent from score of transferred embryos.
  
  
  CONCLUSIONS
  E2 on hCG day is not correlated with pregnancy rates and cannot be used to predict pregnancy in neither agonist nor antagonist cycles, no matter its level or percentile is used.
authors.affiliation: Department of Obstetrics and Gynecology, Ankara Education and Research Hospital, 329. Cad. No:25/14 Kırkkonaklar, Ankara, Turkey, eclamptic2000@yahoo.com.
authors.forename: Elif Aylin
authors.initials: EA
authors.lastname: Taşkin
authors.forename: Cem Somer
authors.initials: CS
authors.lastname: Atabekoğlu
authors.forename: Nati
authors.initials: N
authors.lastname: Musali
authors.forename: Derya
authors.initials: D
authors.lastname: Öztuna
authors.forename: Murat
authors.initials: M
authors.lastname: Sönmezer
mesh_terms: D000293:Adolescent; D000328:Adult; D006063:Chorionic Gonadotropin / Q000008:administration & dosage*; D015536:Down-Regulation; D004624:Embryo Transfer; D004958:Estradiol / Q000097:blood*; D005260:Female; D005300:Fertility Agents, Female / Q000008:administration & dosage; D005307:Fertilization in Vitro; D005640:Follicle Stimulating Hormone / Q000008:administration & dosage*; D007987:Gonadotropin-Releasing Hormone / Q000819:agonists* / Q000037:antagonists & inhibitors*; D006801:Humans; D016729:Leuprolide / Q000008:administration & dosage; D009865:Oocytes / Q000187:drug effects; D011247:Pregnancy; D018873:Pregnancy Rate; D012189:Retrospective Studies
chemical_list: D006063:Chorionic Gonadotropin; D005300:Fertility Agents, Female; D007987:Gonadotropin-Releasing Hormone; D004958:Estradiol; D005640:Follicle Stimulating Hormone; D016729:Leuprolide