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Related Experiment Videos

The neglected morula/compact stage embryo transfer.

Jun Tao1, Robert Tamis, Katharine Fink

  • 1Arizona Institute of Reproductive Medicine, Phoenix, Arizona, USA. jtftc@aol.com

Human Reproduction (Oxford, England)
|June 4, 2002
PubMed
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A new grading system for morula/compact embryos shows day 4 transfers require fewer embryos than day 3. This method improves embryo selection, leading to similar or higher pregnancy rates with reduced embryo numbers.

Area of Science:

  • Reproductive Medicine
  • Embryology
  • In Vitro Fertilization

Background:

  • Retrospective analysis of 339 embryo transfers on day 3 or day 4.
  • Focus on morula/compact embryo grading and its impact on transfer outcomes.

Purpose of the Study:

  • To propose and validate a grading system for morula/compact embryos.
  • To compare outcomes of day 3 versus day 4 embryo transfers using the proposed grading system.

Main Methods:

  • Developed a grading system based on blastomere compaction, morphology, prior embryo quality, and fragmentation.
  • Classified embryo transfers into three groups based on the number of 'good' embryos transferred.

Main Results:

  • Day 4 transfers used significantly fewer embryos in groups II and III compared to day 3 transfers.

Related Experiment Videos

  • Day 4 transfers with all 'good' embryos showed significantly higher implantation rates (46.4% vs. 21.4%) with fewer embryos transferred (2.1 vs. 3.5).

    • Conclusions:

    • Morula/compact embryo grading is valuable for selecting embryos.
    • This grading system significantly reduces the number of embryos required for transfer, optimizing IVF outcomes.