I think that almost any 3 or 4 year old is going to have problems staying focused for the length of an IQ test, and so I would hesitate to worry about issues with attention and focus at this point (or for a good long while, actually). Even if your child is super smart, that doesn't mean that he has the attention span of an older child. In fact, sometimes the world is even more exciting for a highly intelligent child, so it can make focusing on just one thing that much more difficult. I'm not sure you can actually make a diagnosis of ADHD or something similar at such a young age.
Can I ask why you had your son tested? Have you been seeing signs of a problem or were you trying to get him into a program of some sort?
Also, definitions of giftedness vary from person to person and program to program. Some schools, for instance, consider an IQ above 120 to be gifted (corresponds to 90th percentile, I think) while others consider 130 the cutoff.
