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.