Genetic testing

I’m not sure which test they used for my son but my Medicaid paid for it, but I got told this time around I have to get the genetic testing done since he has a heart defect. Which I’m curious about because they told me last time the genetic testing was only done for certain genetic mutations so how would they see if this baby has any type of heart defect as well. Or should I ask my midwife when I go on the 20th for my 8 week ultrasound and normal check up.