I don't have the exact test names - we don't have our test reports back yet (I have the verbal reports) - but... I can tell you that chances are very high that the level of testing you had done by the Speech Language Pathologist (SLP) was not necessarily complete. This additional set of tests is very new... many SLPs don't even know about this yet, and then there is the whole problem of funding for these tests etc. Here, we are fortunate that it was added to a particular "group" of existing services that actually makes sense - but it takes time to get in.
You may not be able to get this level of testing yet - in fact, it would be highly unlikely, given his age and possible other dxes. This is usually one of the "last" dxes... other things need to be ruled out or propper accomodations in place (adhd, for one - ruled out or medicated... because uncontrolled adhd makes the necessary testing impossible to do accurately).
But YOU need to be watching for it. Does it make a difference if he's in a noisy environment? How quiet is your home? (is the tv/radio on all the time? in that case, its constant background noise)
Another one you (and probably "they") won't be able to really test yet... is Central Auditory Processing Disorder (CAPD) - which involves a spread of language capabilities, with written being significantly stronger than verbal... but he doesn't have written skills yet (reading, writing).
Did they screen for hearing problems in general?
In other words - you need to know exactly what tests were done, which tests were not done (and why, and what the recommendation is for re-testing). At his age, you will NOT get a complete list of dxes. Too many variables, too many conditions that don't test well until later. But you need ALL the info you can get - so you know what else to get done when, and how, and why, and so on.
Did we suggest starting a parent report yet? Its under Site Resources. It will help you keep track of all this stuff and more!