Squishys - I recall something about a discrepancy of two (three?) or more standard deviations (15 pts per) between high and low scores qualifying as a disability, regardless of how high the "low" is.
I think it's important to note that a discrepancy *might* be due to an LD, but it could exist in an individual without the presence of an LD. Typically what happens with an LD diagnosis is that a person will have some type of struggle or area of weakness, that might (or might not) show as a discrepancy in IQ subtest scores or ability vs achievement scores - when the discrepancy is noted combined with observations of a challenge, *then* additional testing is conducted to determine the nature of the discrepancy and challenges. It's not as straightforward as "a discrepancy of > 30 points = LD" and likewise, not a guarantee that there's an LD simply because there is a discrepancy.
polarbear
