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Should extended blastocyst culture include Day 7?

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Extending embryo culture to Day 7 can identify viable blastocysts, increasing embryo availability and pregnancy chances for in vitro fertilization (IVF) patients. This practice helps select top-quality embryos that might otherwise be discarded.

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Area of Science:

  • Reproductive Medicine
  • Embryology
  • In Vitro Fertilization (IVF)

Background:

  • Extended embryo culture to the blastocyst stage is standard practice for improved embryo selection in IVF.
  • Embryo selection and transfer decisions are typically made by Day 5 or Day 6 of culture.
  • Embryos not meeting criteria by Day 6 are often discarded, potentially including viable, slower-developing embryos.

Purpose of the Study:

  • To evaluate the viability and clinical significance of Day 7 blastocysts.
  • To determine if extending embryo culture an additional day increases the number of usable embryos.
  • To assess the potential for improved pregnancy outcomes by including Day 7 blastocysts.

Main Methods:

  • Review of current practices in extended embryo culture.
  • Analysis of Day 7 blastocyst development, morphology, and ploidy status.
  • Assessment of clinical outcomes associated with Day 7 blastocysts.

Main Results:

  • Day 7 blastocysts can be viable, morphologically excellent, and euploid, leading to healthy live births.
  • A small percentage (5%) of usable blastocysts develop on Day 7.
  • Culturing to Day 7 increases the number of usable embryos per IVF cycle, offering further pregnancy opportunities.

Conclusions:

  • Viable Day 7 blastocysts, though a minority, are clinically significant and should not be prematurely discarded.
  • Extending embryo culture to Day 7 enhances embryo utilization and provides additional chances for pregnancy, particularly for patients with limited embryo numbers.
  • This extended culture approach optimizes IVF cycle outcomes by maximizing embryo potential.