Egg donation is regulated by law in the United States, although legislation varies from state to state. There is no obligation to choose an anonymous egg donor.
Tag: healthy embryo
A couple of first cousins has achieved a twin pregnancy after undergoing an embryo transfer with a single, healthy embryo chosen from a cohort of 25 oocytes removed from the woman after follicular puncture.
By means of a pre-implantation genetic diagnosis, the nucleus of a cell from the embryo is analysed in order to see if it has some genetic disorder or chromosomal alteration which can lead to the development of any disease.
Embryos can be classified in 4 categories –from A to D– ranging from best quality to least developed embryos. This classification is mainly visual and rather subjective, but there are also several studies to identify their metabolic activity.