Normally, when an in vitro fertilization (IVF) treatment is performed, a high number of embryos are obtained. However, only a maximum of 3 embryos should be transferred. For this reason, the remaining embryos can have several fates:
- Freezing for future transfers.
- Donation to other couples.
- Donation for research purposes.
- Destruction once the woman's reproductive stage has ended.
If it is decided to donate the embryos to other couples or to research, it will be necessary to sign an informed consent where the destination and purpose for which the embryos will be used is expressed.