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Anyone here with experience with developmental specialists / autism diagnosis .... would part of the developmental testing be IQ testing as well?

Both my boys had partial WISC IV (I don't know why they didn't do the whole things) as part of an evaluation to see if they were ASD, although I know there are other/better tests for ASD that your specialist may use in conjunction with or instead of WISC. Others here will know more, I'm sure.