yeah, it was in my dyslexia and dyspraxia diagnosis. they measure something like IQ so that they have a baseline of how you "should" be performing. its not overly long or particularly uncomfortable - it should be done in maybe 2 hours max. he talked to me about my handwriting difficulties and coordination problems, explained to me what dyspraxia even was, and seemed like if anything he was trying to tilt things in favour of me getting diagnosed, saying things like "it doesn't matter if it you can funtion anyway, it matters if it negatively impacts you" or "no one fakes a disability, especially not by accident". its basically just a chat, a literacy test, and rotating some shapes etc.

for example, my spelling and my reading/writing time were like 2% below the national average, but since they were significantly below what my IQ implied they should be, i was declared dyslexic anyway and got accomadations for that. Without an IQ (and the other skills that that test measured) to compare to, i probably would have been declared neurotypical and gotten absolutely screwed over during my exams lol. WAIS makes sure that people who are outside the norm are treated properly despite the fact that their symptoms likely show quite differently.

for me it was free though - it might be worth seeing if your job/university/etc could pay for it? or if it can be put on health insurance? (i'm not in amerikkka, i have no idea how for-profit healthcare works, sorry)