WPPSI-III is the Wechsler Preschool and Primary Scale of Intelligence

http://pearsonassess.com/HAIWEB/Cultures/en-us/Productdetail.htm?Pid=015-8989-317

It is for ages 2 1/2 to 7 (although probably not recommended for gifted kids over age 6)

SB-V Is the Stanford Binet Intelligence Scales

http://www.riverpub.com/products/sb5/details.html

for ages 2 through 85.

You could ask the doctor about it. I don't know whether insurance would cover it or not. Ours only partially covered the testing.