PGS is a recent genetic screening test which assess for chromosomal abnormalities on embryos before it is implanted during an IVF cycle. This allows screening for the best embryos to be implanted thereby reducing the probability of an unhealthy foetus with certain congenital diseases.
In this technique a small biopsy is taken from an embryo which is then analysed by comparative genomic hybridisation (aCGH) with chromosomal profiling of all 24 chromosomes so as to detect common genetic abnormalities such as aneuploidies like Down syndrome, Edwards syndrome and Patau syndrome etc.