Journal of Assisted Reproduction and Genetics

, Volume 15, Issue 10, pp 594–598 | Cite as

Low Blastocyst Formation Rates in Day-2 Fertilized Oocytes

  • John Gullett
  • George M. Grunert
  • Cecilia T. Valdes
  • Randall C. Dunn
  • Wan-Song A. Wun


Purpose: To examine the blastocyst formation rates of day-2 fertilized oocytes.

Methods: A retrospective study of the outcomes/blastocyst formation of day-2 fertilized oocytes was undertaken.

Results: Fertilization rates of day-1 and -2 oocytes by intracytoplasmic sperm injection were similar. The development frequencies to four cells were similar. However, the blastulation rates were significantly lower from the day-2 fertilized eggs. The fertilization rates from day-2 conventional in vitro fertilization reinsemination were lower than the fertilization rates of day-1 oocytes. The blastulation rates from day-2 fertilized eggs were also lower than the rates from day-1 fertilized eggs in the in vitro fertilization group.

Conclusions: Fertilization is not a good indicator to predict the viability of fertilized oocytes. Day-2 fertilized oocytes had significantly lower blastocyst formation rates than the rates from day-1 fertilized oocytes.

blastocyst development fertilization intracytoplasmic sperm injection in vitro fertilization 


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Copyright information

© Plenum Publishing Corporation 1998

Authors and Affiliations

  • John Gullett
    • 1
  • George M. Grunert
    • 1
  • Cecilia T. Valdes
    • 1
  • Randall C. Dunn
    • 1
  • Wan-Song A. Wun
    • 1
  1. 1.Assisted Reproductive Technology ProgramObstetrical and Gynecological AssociatesHouston

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