If he is only two and you are concerned about his giftedness being an issue in a typical classroom, then he must be a "very" gifted kid. Most parents don't question it until there is a problem with fit in preschool or kindergarten.
Testing a child younger than five is a crap shoot. You might get an accurate picture of his intelligence, but you might not. Another reason to wait is that many programs want information that is fairly current- as in obtained in the last year or two. Unless you need the numbers to get him into a specific program, I'd encourage you to wait *at least* until age four.
I'd love to hear more about your son, and what you forsee his issues with school might be.
take care-
