ABR?
That is sad if that is all they do in this day and age of technology.
You need a pediatric audiologist who uses special techniques to get accurate assessments of hearing loss in children. Many regular audiologists just do an ABR when the child is very young but there are more specific tests that a child can be trained to respond to.
The sooner this is done, the better.
Speech pathologist for a hearing test? Why not a podiatrist or a carpenter for that matter.
Really, speech pathologist can legally do hearing screening, and know very little about hearing, hearing diagnostics, anatomy & physiology etc.
Essentially, you need to have your g. son tested by an audiologist.. THE END. I would consider all information provided by others as inconclusive until then.