If you have loads of extra money, have him tested now, then again in 2 years and you can see for yourself if the second language was a barrier.
It would be fascinating to have both sets of results, though I'm a bit wary of making DS feel like he's a guinea pig. Ah, who am I kidding? Of course he's a guinea pig - he's our first kid!
Seriously, though, although we're comfortable I wouldn't describe us as having "loads of extra money", and two sets of tests would certainly come at the expense of something. In fact, financial considerations played some role in our reaction to the meeting, since one of the things that most impressed DW about the evaluator was her enthusiasm in suggesting that we wait. Of course it's her job to say what she thinks is best, but in this case that amounted to suggesting that she not take a lot of money from us. At the very least it was quite professional.
LMom: thanks for your comments. I'm sending a PM to you right now.
BB