"Does not apply" COULD mean that a child hit 19, but would not have any raw score points beyond 19, if criteria were "extended." In other words, a 19 on the WISC, from what I understand can mean a child just hit the 19 (just enough raw score points) or actually scored enough points that if scoring continued, they could have earned more scaled points (i.e., a 23 instead of a 19). It is somewhat similar to the concept of not all 99 percentiles being the same on a grade level test. On a MAP test, you will still have a 99%, despite the fact that the RIT score could be a 99% two grades up. Again - my limited understanding.
Jefferson - this may or not be the case with your DC. IF you have the raw scores, you could double-check the extended norms chart:
http://images.pearsonclinical.com/images/assets/WISC-IV/WISCIV_TechReport_7.pdf Also, a 19 is very high!
