4doggiemama has had no problems in 11 yrs so you could pm her and i'm sure she would have a wealth of info.
This website a friend of mine sent me when i was thinking of getting a pup a while back. The additional testing is if a problem arises from blood work or other parts of the examination. I hear some get the EKG
Preparing Your Dog for General Anesthesia and Surgery | Common Medical Diagnostic Tests for Dogs | FetchDog
There should be more people with tines here that could give more input.
4doggiemama for sure.