I encourage you to get private testing, and to read up at hoagiesgifted.org about the various tests. If that is in your mind, the next question is "how far should I travel?"
If your child is up in the top 2% of IQ, then local psychologists with experience in testing gifted should be ok. If your child is in the top .01%, plan to research and travel, it will be worth your while. Which begs the question, how does one know in advance?
One way is to read Dr. Ruf's book. Here's a discription from Hoagies:
Losing Our Minds: Gifted Children Left Behind by Deborah L. Ruf
Using gifted children as examples, Ruf illustrates five levels of giftedness, which parents will be able to estimate in their child by comparing developmental milestones...
or you can start with a web version at educationaloptions.com
http://www.educationaloptions.com/raising_gifted_children.htmIf you wish, post more details about your concerns. We love to hear all the stuff you can't tell your neighbors.
welcoming smiles,
Trinity