title: Predictive value of pregnancy during original in vitro fertilization cycle on implantation and pregnancy in subsequent cryothaw cycles.
abstract: OBJECTIVE
  To understand the homogeneity of oocyte quality within a cohort.
  
  
  METHODS
  All women (n = 367) that had cryopreserved pre-embryos subsequently thawed were studied. Pregnancy and implantation rates in the in vitro fertilization (IVF) and cryothaw transfers were examined.
  
  
  METHODS
  Tertiary care academic center.
  
  
  RESULTS
  Pregnancy in original IVF cycle predicted higher implantation rates at subsequent cryothaw transfers. Similarly, pregnancy in cryothaw cycles was associated with higher implantation and ongoing pregnancy rates at the initial IVF cycle.
  
  
  CONCLUSIONS
  Within a cohort of oocytes, pregnancy with some of the pre-embryos in a cohort predicts pregnancy with the remaining oocytes in the cohort. Thus, oocytes within a cohort have similar pregnancy potential.
authors.affiliation: Jones Institute for Reproductive Medicine, Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk 23507.
authors.forename: J P
authors.initials: JP
authors.lastname: Toner
authors.forename: L L
authors.initials: LL
authors.lastname: Veeck
authors.forename: A A
authors.initials: AA
authors.lastname: Acosta
authors.forename: S J
authors.initials: SJ
authors.lastname: Muasher
mesh_terms: D015925:Cryopreservation; D010064:Embryo Implantation; D004622:Embryo, Mammalian; D005260:Female; D005307:Fertilization in Vitro; D005544:Forecasting; D006801:Humans; D011247:Pregnancy; D013223:Statistics as Topic