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Related Experiment Video

Updated: Feb 11, 2026

Human Blastocyst Biopsy and Vitrification
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Learning Aspects in Implementing Vitrification Program Using Mouse Blastocysts.

E J Hoekman1, K E Tucker2, C Am Jansen2

  • 1Dept. of Gynecology, Leiden University Medical Center, Leiden; IVF Dept., Reinier de Graaf Group, Voorburg, The Netherlands. e.j.hoekman@lumc.nl.

Cryo Letters
|May 8, 2018
PubMed
Summary

Practicing oocyte vitrification with mouse embryos improves success rates. Warming techniques are crucial for optimizing protocols before human applications, enhancing fertility preservation.

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Area of Science:

  • Reproductive Science
  • Embryology
  • Cryobiology

Background:

  • Oocyte vitrification is a key technique for fertility preservation.
  • Standardization of vitrification protocols is debated.
  • Developing efficient vitrification programs requires practice.

Purpose of the Study:

  • To assess the suitability of mouse blastocysts for practicing vitrification.
  • To identify factors influencing the learning curve in vitrification procedures.

Main Methods:

  • 58 mouse blastocysts from frozen embryos were vitrified and warmed using a closed device and ethylene glycol.
  • Survival rates were assessed immediately after warming (T0) and after 24 hours of culture (T24).
  • Two separate vitrification and warming attempts were performed to analyze learning curve effects.

Main Results:

  • Overall survival rates at T0, T2, and T24 were 70.6%, 60.3%, and 34.4%, respectively.
  • Embryo loss was significantly higher during the first warming attempt (WA1) compared to the second (WA2).
  • Survival rates improved significantly from WA1 to WA2, indicating a learning effect.

Conclusions:

  • Commercially frozen mouse embryos are valuable for training and initiating human oocyte and embryo vitrification programs.
  • Mastering the warming step is critical for optimizing protocols and building confidence.
  • Practice with mouse embryos facilitates adaptation and refinement of vitrification techniques for clinical application.