Embryo culture and selection: morphological criteria
1Division of Reproductive Endocrinology and Infertility, Department of OB/GYN, Stanford University, Stanford, CA, USA.
Methods in Molecular Biology (Clifton, N.J.)
|May 1, 2014
Summary
Selecting the best embryo involves using multiple morphological criteria at key developmental stages. Combining several selection points improves accuracy, as no single criterion is definitive for embryo assessment.
Area of Science:
- Embryology
- Reproductive Biology
- Developmental Biology
Background:
- Embryo selection is crucial for successful assisted reproductive technologies.
- Morphological assessment is a primary method for evaluating embryo quality.
- Identifying optimal embryo selection criteria remains an ongoing challenge.
Purpose of the Study:
- To outline morphological criteria for selecting the best embryo during in vitro culture.
- To emphasize the importance of multiple selection points for accurate embryo assessment.
- To highlight the limitations of culture in correcting impaired embryos.
Main Methods:
- Review of established morphological criteria for embryo assessment from oocyte to blastocyst stage.
- Discussion of the utility of single versus multiple selection points.
- Analysis of embryo development milestones and associated selection criteria.
Main Results:
- No single morphological criterion is superior for embryo selection.
- A combination of multiple selection points enhances the accuracy of identifying the best embryo.
- Embryos failing to meet all selection criteria are unlikely to be corrected by culture.
Conclusions:
- Comprehensive morphological assessment using multiple criteria is essential for optimal embryo selection.
- Early identification of developmental defects is critical, as culture cannot rescue impaired embryos.
- Integrating various selection points improves the predictive value of embryo quality in assisted reproduction.
