How does Pre-Implantation Genetic Screening work?
PGS involves removing a few cells from an embryo and analyzing them for chromosomal abnormalities or genetic mutations. The cells are typically removed on the third day of embryo development when the embryo contains between 6 and 10 cells. The cells are then sent to a laboratory for analysis.
There are two main techniques used in PGS: fluorescence in situ hybridization (FISH) and comparative genomic hybridization (CGH). FISH is used to analyze a small number of chromosomes, while CGH can analyze all 23 pairs of chromosomes.
The results of PGS can be used to determine which embryos are free from genetic abnormalities and are most likely to result in a healthy pregnancy.