Sonograms are non-evansive. They just put some jel on the skin and run a transducer over it. A picture, not really clear, of the area inside the skin appears on a black and white screen. I just had a sonogram of my heart and watched it beat. That was an echocardiagram. Sonograms use sound to get data for the computer. They can even make little movies of moving parts of your insides, but hernias probably only have bloodflow.
Good luck. All Children's is a good hospital and probably has the most up to date equiptment, plus their staff is good with children.
S. C.
Mother, Teacher, and Librarian