Requirements are not listed. It's like some a secret panel meets and considers 3 data points (that's what I was told) in order to make their decision. The district web site says data points might include standardized cognitive abilities assessments, achievement tests, portfolios, classroom work samples, parent and educator input through a standardized instrument such as the SIGS and/or notes from an interview with the learner.
This is also their policy
Gifted and Talented Services are designed to provide an academically challenging education for learners who perform or show the potential to perform at a remarkably high level of accomplishment when compared to other learners of the same age, experience, or environment and:
Exhibits high performance capability in an intellectual, creative, or artistic area;
Possesses an unusual capacity for leadership; or
Excels in a specific academic field.