Freezing Treatment (FER)

Summary: FER is short for Frozen Embryo Replacement. An embryo is an egg that is fertilized after being thawed as a frozen egg. This embryo was extracted and fertilized earlier in a “fresh” attempt, also known as a trial attempt, and is used in a later cycle.

Where do the frozen embryos come from?

The frozen embryos we thaw and put back into FER-treatment are embryos the couple previously had frozen after a fresh attempt where several eggs are stimulated and extracted, fertilized in a test tube, and allowed a few days to evolve and mature to the blastocyst stage. So, FER-treatment is not a treatment you can start right away. You must first complete a fresh trial.

How does a FER treatment take place?

During in vitro fertilization (IVF) we often get more than enough good embryos to put back. These we can freeze and put back at a later time in a later cycle. The benefit of FER is that a woman avoids going through the whole treatment of stimulation and egg extraction again. The thawed embryo is inserted during a natural or lightly stimulated cycle in a simple, painless procedure that is over in a matter of minutes.

Frozen embryos can be stored for up to five years. The embryos can only be assigned to the couple they came from.

Do you want to start a FER treatment? Or, call us to arrange the thawing of your frozen embryo. You will find the form for thawing confirmation here.

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