I was under the impression that all the Chromosomes were tested for.
For example 10 of our embroyos fertilized. Several of our blasts looked perfect. Visibly they were perfect.
But they were missing chromosomes. And some of them had extra chromomsomes. Out of all of our embys only 2 were perfect.
It did cost quite a bit to do the test, but emotionally I thought I needed to know. Not that I personally have suffered any more or less than anyone else, but I emotionally could not handle an early miscarriage.