Welcome ePink! Does your child qualify for your school's GT programming with his scores? What specifically are you trying to learn from these scores? Different districts will have different qualifying numbers, but 139 composite I would guess would be qualifying for most GT programs. I'm not especially familiar with CogAT, but I do know it's just a screener, and there is not really any way you can tell what level of GT your kiddo is with just the CogAT. Some very highly kids do not do as well on screener tests like CogAT, whereas some moderately GT kids can score quite high.
From the little I know, it looks like math would be your kiddo's strength, but the verbal and nonverbal are not weaknesses, those are good scores too. I remember someone posted a link here once where you could punch in the numbers and get sort of a score profile from Riverside publishing.
http://www.riverpub.com/products/group/cogat6/input.jspETA. Found the link. looks like this includes form 7.
ETA again... oh, looks like you'll need the profile numbers that go along with your scores. I'll search some more....
ETA - this guide is about Form 6, but if the stanines are similar, then I'd guess that your kiddo, based on composite, is a 9B profile Q+, which you can plug into the link above. But of course I'm just winging this, and hopefully a testing guru will post.
http://www.riverpub.com/products/cogAt/pdf/cogATshort.pdf