Preimplantation genetic testing (PGT) is carried out during IVF. A few cells are taken from each embryo and tested before transfer, so that embryos unaffected by a specific condition or chromosomal change can be selected.
PGT-M tests for a known inherited condition, PGT-SR for structural chromosome changes, and PGT-A for an abnormal number of chromosomes. Genetic counselling before and after testing helps you understand what results can and cannot tell you.