Related Experiment Videos
Blastocyst culture: myth or magic?
1Reproductive Medicine Unit, Liverpool Women's Hospital, Crown Street, Liverpool L8 7SS, UK.
Human Fertility (Cambridge, England)
|October 10, 2001
Summary
Extended embryo culture to blastocyst stage (days 5-6) shows higher implantation rates (40%) than early transfer (days 2-3, 20%). This review explores challenges and benefits of blastocyst transfer and culture.
Area of Science:
- Reproductive medicine
- Embryology
- In vitro fertilization
Background:
- Sequential serum-free culture media enable extended embryo culture.
- Blastocyst transfer (days 5-6) is associated with higher implantation rates compared to cleavage-stage transfer (days 2-3).
Purpose of the Study:
- To examine uncertainties and challenges associated with extended embryo culture and blastocyst transfer.
- To discuss clinical indications, laboratory implementation, and implications of blastocyst culture.
Main Methods:
- Review of existing literature and clinical considerations regarding extended embryo culture.
- Analysis of developmental capacity, uterine receptivity, and clinical outcomes.
Main Results:
- Reported implantation rates increase from approximately 20% for day 2-3 transfer to 40% for day 5-6 (blastocyst) transfer.
- Blastocyst transfer may reduce multiple pregnancy rates and is relevant for preimplantation genetic diagnosis (PGD).
Conclusions:
- Extended culture to blastocyst stage offers potential benefits, including improved implantation rates and reduced multiple pregnancies.
- Further consideration of embryo developmental capacity, uterine environment, and laboratory integration is necessary for optimal implementation.