While teachers and school psychologists have the ability to initiate evaluations for special education service eligibility, they are unqualified to make medical diagnoses. Attention deficit hyperactive disorder (ADHD), autism spectrum disorder (ASD), and physical and developmental delays must be diagnosed by a physician. Although most children with physical or developmental delays, who have received consistent medical care , are diagnosed at an early stage by their pediatricians, it is imperative to include a medical professional in the student's evaluation process if one of the aforementioned conditions is suspected but undiagnosed. When children are diagnosed early, they can start receiving services at earlier stages of development. State health and/or education departments offer early intervention services for children under the age of three years, while the public school system offers services for children from ages three through twenty-one.