title: Effect of duration of estradiol replacement on the outcome of oocyte donation.
abstract: OBJECTIVE
  To investigate if duration of estrogenic endometrial stimulation can affect recipient pregnancy rate in an ovum donation program.
  
  
  METHODS
  Each recipient received micronized 17 beta-estradiol orally in a steadily increasing dosage from 2 to 6 mg daily over a period of time varying from 5 to 76 days until oocyte were available for donation. Recipients (520 patients for a total of 835 transfer cycles) were retrospectively divided into five groups depending on the duration of E2 administration.
  
  
  RESULTS
  No significant difference was seen in pregnancy and implantation rates between groups. There was a higher number of miscarriages in Group A (41%), p < 0.05 vs. Group B (15%), and vs. Group E (1%). Age, number of pregnancies and miscarriages, or implantation rate in donors (327 women aged < 35 years) were similar in all the five groups.
  
  
  CONCLUSIONS
  Endometrial receptivity is tolerant to a wide duration of E2 treatment (until 2 months), while waiting for oocytes available for donation, but best results are achieved with a treatment range of 11 to about 40 days.
authors: Tecnobios, Center for Reproductive Health, Via Dante 15, I-40125 Bologna, Italy.
authors: A
authors: A
authors: Borini
authors: L
authors: L
authors: Dal Prato
authors: L
authors: L
authors: Bianchi
authors: F
authors: F
authors: Violini
authors: M
authors: M
authors: Cattoli
authors: C
authors: C
authors: Flamigni
mesh_terms: D000022:Abortion, Spontaneous / Q000139:chemically induced; D000328:Adult; D000367:Age Factors; D006063:Chorionic Gonadotropin / Q000032:analysis; D010064:Embryo Implantation / Q000187:drug effects; D004624:Embryo Transfer; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D005307:Fertilization in Vitro / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D018587:Oocyte Donation; D011247:Pregnancy / Q000187:drug effects; D011256:Pregnancy Outcome; D011271:Pregnancy, Ectopic; D012098:Reproduction / Q000187:drug effects*; D013997:Time Factors; D016216:Ultrasonography, Prenatal
chemical_list: D006063:Chorionic Gonadotropin; D004958:Estradiol