PGS, or more recently renamed PGT-A, is when a biopsy of cells from the embryo is removed to check the number of chromosomes that it has.
PGS, au iliyopewa jina la hivi majuzi zaidi PGT-A, ni wakati biopsy ya seli kutoka kwa kiinitete inatolewa ili kuangalia idadi ya kromosomu iliyo nayo.