I don't think I would bother with an IQ test unless you have concerns there is a cognitive impairment (i.e. below average IQ). With DS at age 3, and all of his various delays, we had no idea that what we were dealing with was a 2e situation. But the testing back then didn't even show that. It was helpful to see that he didn't have any serious deficiencies, and it was helpful to see that he was very strong in some areas (like visual spatial ability) as opposed to verbal, but at that age it didn't really tell us enough to give us a real diagnosis or anything. So we walked away with "develomentally delayed", just like what we had when we walked in. Another reason I took him to the psych was he had all kinds of oddities indicative of autism spectrum, like delayed speech, hand flapping, toe walking, odd animal noises and speech patterns, etc. She observed him and ruled that out.
