Nowadays, thanks to technological advances, a pre-implantation genetic diagnosis with CGH arrays allows the evaluation of the 23 pairs of chromosomes with the aim of choosing the healthiest embryo for the transfer.
Tag: embryo biopsy
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.
It is important to perform the assisted hatching only in cases where it is clearly indicated. If it is performed on embryos which would hatch naturally, chances for pregnancy would not increase.
Embryo biopsy is a step in the process of PGD which consists of removing one or two cells from the embryo without compromising its normal growth so that an assessment and a genetic study of the embryo can be conducted. The biopsy can be performed before or after fertilisation, the former by biopsying the polar body, and the latter by biopsying a blastomere from the embryo on day 3 or on day 5.