Literally, there are two ways by which embryo donation can become in effect.
The first entails the creation of fresh embryos following the fertilisation of donated eggs with donated sperm. This n option allows for a broader comfort of choice. pertinent to the fact that several eggs and sperm donor profiles can become available for selection.
The second option gives the recipient the choice of already frozen embryos which had been created and frozen as surplus from previously completed:
1) IVF Treatment cycle.
It must be noted that the pregnancy rates with the second option are lower than the first pending the fact that the couples who donated their embryos have already been successful for 1 or more term pregnancies using embryos from the same.
Moreover, it is unlikely that this option can materialise more than one pregnancy by contrast to its counterpart option one.