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ADHD Evaluation A thorough evaluation is required to determine if a person has ADHD. A diagnosis is dependent on the presence of symptoms that began at the age of 12 and that significantly hinder school, work or social interactions. Rating scales are commonly used tools for assessing ADHD. The CAARS-L-S is a self rating instrument that has been proven to be valid. The observer version (CAARS-L: O) also has good validity. Signs and symptoms Many children have trouble sitting sti