139 is actually a very high score for the NNAT. I believe it above the 99%. The NNAT ceilings out at 150 and anything above 140 is considered in the "ceiling zone". We use it in our district and I've talked to lots of people on the NNAT. I've heard about it testing kids low, but never high. The people I know who've done further tested have only had HIGHER results. Of course that's not a scientific survey, but just an observation I've had in the past year.
Anyway - I would definitely follow up with the school! Find out why exactly he was denied. In our school district, you wouldn't only have access to GT services, you may even have grounds to ask for services above and beyond the standard ones. We live in an urban district and have a pretty liberal GT definition.
