Hi Moo,
Glad you found us!
When you say 'couldn't get a ceiling' do you mean that the test wasn't hard enough for your child, so that your child didn't make enough mistakes to stop the test before the tester 'ran out' of questions?
We usually call that 'hitting the ceiling.'
I'm not familiar with this specific test, but yes, there is a possibility your child is gifted. Does this fit your daily experience with your son?
Go visit a Kindergarden and first grade classroom when school starts up again, and see what the kids are interested and able to do - that will pull you out of your lost-ness.
Smiles,
grinity