It depends on the district, the district that my son is in only uses the cogat and the nnat. No IQ testing is done. They also rely on work samples, student interview, parent and teacher ratings on the SIGS (gifted behavior questionnaire). They have to tick 3 out of 4 boxes to be classified. I've heard from teachers though that if they don't get high enough test scores, they aren't going to be classified, regardless of the other criteria. The other stuff is more for kids who have borderline scores, and to meet guidelines set by the state to use more than one criteria for gifted identification.
For the highly gifted program they also look at district assessments of reading/math level and require higher cogat scores.
