Techniques for slow cryopreservation of embryos

Area of Science:

• Reproductive medicine
• Embryology
• Cryobiology

Background:

• Slow cryopreservation of embryos has been a standard practice for nearly 30 years.
• It is utilized to store surplus embryos from in vitro fertilization (IVF) cycles.
• This technique aims to maximize pregnancy rates while minimizing the loss of valuable biological material.

Purpose of the Study:

• To provide detailed methodology for slow embryo cryopreservation.
• To describe the use of a specific biological freezing unit (Planer PLC).
• To outline culture media preparation and embryo transfer protocols for both natural and stimulated cycles.

Main Methods:

• Detailed description of the slow cryopreservation technique.
• Utilized a Planer PLC biological freezing unit.
• Included protocols for culture media preparation and embryo transfer (natural and stimulated cycles).

Main Results:

• Established a comprehensive protocol for slow embryo cryopreservation.
• Demonstrated the application of the method with a specific commercial freezing unit.
• Provided guidelines for successful embryo transfer post-thaw.

Conclusions:

• Slow cryopreservation is an effective method for preserving embryos from IVF.
• Detailed protocols ensure efficient use of biological materials and maximize pregnancy potential.
• The described methods are applicable to both natural and stimulated human reproductive cycles.