My son has SPD and we also tried to assess him and the psych told us that his IQ score was not a good indicator either due to his SPD....there is also a lot of research all over the internet about it as well. He has issues with being very distracted in locations he has never been due to his over-sensititives so if the air kicks on, they have any kind of funky potpourri or cleaning materials, fluorescent lighting....the list goes on...he will switch his focus momentarily to where he is being bombarded sensory wise and then will focus back on the assessment. She told us it would benefit us if we found an assessor that has experience with SPD children or possibly finding someone who could come test in our home. We finally found a person across the state who is going to assess him next week = she works out of a special OT gym that is for SPD children and we will have the entire gym to ourselves for the entire testing procedure so he can swing or bounce on a ball or whatever sensory needs he has to have met while he is testing to give us a more accurate look hopefully!
So yes, a child with SPD can have issues taking IQ tests
