Not all transfer recipients are the females who provided the eggs. Embryo transfer may be performed on a woman who has an appropriately prepared uterus but doesn't have the ability to produce eggs. The donated eggs may be fertilized with a donor's sperm or with the recipient's partner's sperm. For women who cannot carry a pregnancy to term but can produce viable eggs, a transfer recipient, or surrogate, may be elected to carry the embryo(s) to term. Embryo transfer, the last step in IVF, has opened the doors of possibility for many women who wouldn't be able to conceive otherwise.