Esther Marbán, fertility specialist at the Tambre clinic in Madrid, explains the IVF process with cryopreserved eggs:
The procedure is exactly the same. So, we will fertilize the eggs (that will be previously defrost at the laboratory), we will create the embryos and, depending on the treatment the patient wants to undergo, we will decide if we can do the embryo transfer with a fresh embryo or not. What we normally do is, if the patient agrees in doing the first embryo transfer with a fresh embryo, the patient should undergo a treatment to prepare the uterus to have it in the best conditions possible. After that procedure, we will defrost the eggs, they will be fertilized and the embryos (that will be created at the laboratory) we will select the best quality embryo to the embryo transfer. However, if the patient prefers to undergo what we call the pre-implantational genetic screening, she doesn't need to start her preparation until the embryos are ready. So, we defrost the eggs, we create the embryos and we do a small biopsy on the embryos to check them in terms of the chromosomes. After having suitable embryos to be transferred, the patient will start her preparation to transfer that embryo.
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