Frozen Embryo Transfer

Frozen Embryo Transfer (FET) In women with excess good quality embryos that will not be transferred, these embryos are frozen for use later e.g. if no pregnancy takes place in the fresh cycle or for women seeking a second baby after a successful IVF.

Embryos are frozen using slow freezing or vitrification. Vitrification or rapid freezing is associated with better survival for embryos at thawing. Embryos can be stored for years.

The Benefits of Freezing Embryos


When ready to use the embryos the cavity of the uterus is checked using saline sonography (a simple office procedure) or hysteroscopy and any abnormal findings corrected. The lining of the uterus has to be prepared before transfer. There are two methods to prepare the lining of the uterus during frozen thaw cycles:

Outcome of Frozen-Thawed Embryo Transfer

The survival of frozen embryos exceeds 95%. When transferred to the uterus they yield pregnancy rates close to those of fresh embryos especially if a good quality embryo was frozen in the fresh cycle. Long term follow up of children born after transfer of thawed embryos does not exhibit any increase in birth defects.


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