As the woman grows older, the risk of having abnormal amounts of chromosomes increases. This is why most of the time, this test is recommended for women who are older than 35 years old and are using IVF treatment to conceive a child. It is also suggested to a woman who has had recurrent miscarriages. https://www.usmails.co/what-is-the-use-of-pgd-and-pgs-tests-and-which-one-do-you-need/ more