It appears from the technical documentation that the first two-thirds of the test is taken only from grade-level material, which suggests that, although adaptive testing helps the test approach instructional level for most students, those at the very extremes of ability are likely to experience some ceiling or floor effects. IOW, once you hit the top of the test for that grade level, you should probably use caution in interpreting the results in terms of above-grade-level standards, since not many of them are directly assessed. That being said, it does appear that some kind of above-grade-level testing is in order for your child.
