The tricky part of it is figuring out when giftedness, ADHD, and SPD occur together and when one thing is being confused with the other. For example, some kids with SPD are thought to have ADHD because the behaviors look similar, but the reasons for them are different. The same thing for gifted kids. But yet, some kids do have all three. There is some discussion that gifted kids have higher levels of SPD, although the data has not been collected to say this for certain. However, it makes sense with the idea that gifted kids experience the world more intensely than others.
From what I've read and experienced, if the child is believed to have ADHD + 'something else', the 'something else' is typically treated/evaluated first. Since there is no definitive way to diagnose ADHD, you would want to treat any other suspected conditions first, in hopes that the ADHD behaviors were simply a result of the other condition.
Sadly, giftedness is rarely, if ever, taken into account.
