At 3, we tested my son and the diagnosis was missed. While he had a lot of sensory issues, the rest just wasn't not typical enough for a 3 year old. At 5 and 6, he could have been classified as being on the less mature side of his peers, but still no glaring delays outside of sensory irritations. At 7, he had a terrible 1st grade year. His teacher hated him and he hated her. He was irritated often in class and started being rude to the teacher and sometimes classmates. However, surprisingly enough the kids still liked him. At this point we weren't sure if it was a teacher problem, a stubborn child, ADHD, or AS.
He is very social. With adults he has always been the little professor. I recall being in triage when I was having contractions with my triplet preganancy and my husband telling me how my son literally was going from each adult's lap in the waiting room, charming them and amazing them with his intellect. He was the kid I always worried about walking off with a stranger because he would talk their ear off. With kids, he tended to have more difficulty in his relationships. However, he has always had some friends that would even come over and play. While my son has favorite things to do, it hasn't crossed over into obsessions, so he has never had a problem playing different games and being flexible in play. He also played typical imagination play. He liked dressing up as Power Rangers and pirates same as other boys his age.
At 8, the social differences became more obvious and we had him tested through our school. However, even then we couldn't say we really felt he was AS. We felt it was possible, but we also knew he was very high functioning and we had no idea if he was "autistic enough" to meet the criteria if that makes sense. Our district has a great team for testing and they look for everything. They did psychological testing, ADHD, speech, as well as autism evaluations. When we recieved their report, it was very thourough. They had observed him in class and individually, as well as did the appropriate tests to draw their conclusions. When their report said autism, specifically Aspergers, while not unexpected, it still took some time to sink in.
We have had his diagnosis for almost a year now. I have no doubts that this is who he is. I am also very glad we found out. There are no more questions after years of knowing something wasn't quite right, but not knowing exactly what no matter how much I researched. For him, it wasn't that we didn't look at everything, including AS, it was just impossible to pinpoint these delays until he reached the age when some of this should have been fading. He can still be mouthy in class and isn't shy about expressing his irritation when classmates bother him. That is one of his goals this year is to work on his rudeness with the teacher and peers. However, as of now, his classmates still seem to like him. I think it is because he also is quick to praise his classmates and tell them "good job". He isn't necessarily picked for kick ball at recess, but he isn't shunned either. He has a few friends that invite him over all the time and they come over here. He has even spent the night at one boy's home a few times. Of course, this kid has ADHD and is very gifted, so his Mom isn't bugged by my son too much. Most of his friends do tend to be the "nerdy" kids for lack of a better word. They are the boys that still like Legos, Star Wars and Harry Potter.
My son is so high functioning that had he not been a mouthy kid, but a quiet one, he probably would have flown under the rader and the school wouldn't have tested him. To be honest, if he hadn't seemed so stubborn and been the more introverted type, we too might not have dug deeper. However, I am glad we went ahead and found out once and for all. He can now get the additional help he needs at school and it has made it so much easier for him to know too.
I don't know all the reasons why you wanted to have him tested, but I wouldn't cross off AS just because he has a good playdate. My son has always had a few friends and always has at least one little girl that "likes" him, giving him notes and coloring pictures for him too.