The specific criteria for diagnosis require at least six symptoms of inattention or hyperactivity-impulsivity (or both) that have persisted for at least 6 months. In addition, ADHD is specified by the severity based on social or occupational functional impairment: mild (minor impairment), moderate (impairment between "mild" and "severe"), or severe (symptoms in excess of those required to meet diagnosis; marked impairment).
Brain imaging, such as functional MRI or SPECT scans, has been useful for research, but no clinical indication exists for these procedures because the diagnosis is clinical.
For more on the diagnostic criteria of ADHD, read here.
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Cite this: Glen L Xiong, Stephen Soreff. Fast Five Quiz: Do You Know the Signs, Symptoms, and Best Practices for Attention-Deficit/Hyperactivity Disorder? - Medscape - Sep 14, 2015.