In the interest of providing current/correct information, I just want to reiterate a couple of points:
The current age 6 and older Wechsler IQ test, WISC IV is ten years old and will likely be replaced by WISC V in the near future to compensate for the Flynn effect and to utilize more current norms. The current under 6 Wechsler IQ test, WPPSI V, has been generating lower scores in the short time that it has been on the market.
Even though DYS appears to require 99.9 percentile, the reality is quite a bit lower because you don't need 99.9 percentile FSIQ. You only need 99.9 percentile GAI or VCI or PRI. The incidence of the latter is much higher than the incidence of the former.
Back to the original poster, DYS requires 150 on the WPPSI but only 145 on the WISC. If you look at it that way, then your DS missed by 8 points on the WPPSI FSIQ and while he missed by 10 points on the WISC FSIQ, he only missed by 3 points on the WISC VCI. Based on some posts that I have seen on this forum, it appears that DYS sometimes accept applicants who don't quite meet the minimum IQ. If your DS has documentations of exceptional achievements, it may be worth submitting to DYS the IQ report along with a portfolio to supplement your qualifying achievement scores.
