With Preimplantation Genetic Testing (PGT) we can study the genetic or chromosomal constitution of an embryo before transferring it to the uterus to detect if it has any alteration.
The PGT, consists of biopsy some cells of the embryo when it reaches its fifth day of embryonic culture, in the Blastocyst state. Cells of the so-called Trophectoderm are extracted. These cells are the ones that form the implant structures and the placenta. Cells of the so-called Internal Cellular Mass, which are the ones that form the fetus, are not extracted. With this cell we can make different variants of the PGT:
It must be taken into account that preimplantation genetic testing (PGT) is a partial study of the genetic material of several cells, so we can only provide information on what is studied in each case, not on the entire embryo.
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