Okla. Stat. tit. 70, § 1210.280

Preschool children, ages three (3) through five (5) years, and students enrolled in K-12 in the public school system of Oklahoma who are suspected of having disabilities which may require special education and related services may utilize the services provided in this act. The service centers and local school districts shall coordinate with the program established pursuant to the Early Intervention Act, Section 13-121 et seq. of this title, in the evaluation and identification of infants and toddlers who may be eligible at the age of three (3) years for special education and related services through the schools.