Parents at risk of passing on a genetic disorder are faced with heartbreaking implications of potentially creating a life with an inherited illness. Common embryo testing procedures require months of laboratory work. But the latest tool, known as karyomapping, can be completed within two weeks. Meaning a couple can undergo tests without breaking from their IVF treatment cycle. The test also checks embryos have the right number of chromosomes, a common cause of miscarriage and developmental disorders such as Down's syndrome. Because embryos are tested before they are implanted, the parents do not face decisions about terminating the pregnancy later on.