In cases where the patient does not produce good quality eggs, usually known as “ovarian failure” or lack of them due to premature menopause, they can resort to egg donation.
In this case a donor is selected with the same physical characteristics and blood group as the patient; the donor undergoes ovarian stimulation and subsequent egg collection.
At the same time the “recipient” patient in a synchronous manner receives a treatment using oral estrogen or transdermal patches to prepare her uterus.
The same day that eggs are retrieved from the donor, they are inseminated with the partner’s sperm and the obtained embryos are left to develop between two and five days in the laboratory.
After which, evolutionary embryos are selected and transferred (usually one or two) to the recipient patient, as is done in a conventional IVF process.
The remaining viable embryos are frozen on the same day, for possible future treatments.
Egg donation is at present the assisted reproduction technique with the best pregnancy rates, exceeding 50% success on many occasions.