I have been reading about stealth dyslexia, and it seems to describe my son extremely well. He is an excellent speed reader (he read the entire Harry Potter series in 4 weeks), but performs below expected on standardized tests in reading comprehension. He has all the problems with dysgraphia and written spelling that are describes in the articles about stealth dyslexia.

Does anyone have any experience with this? I'm wondering how we go about getting tested? What is the treatment/accomodation if he does indeed have this diagnosis?