Here’s information from the American Academy of Pediatrics regarding basic facts about diagnosing ADHD
“JUST THE FACTS…………………. DIAGNOSING ADHD
Between 4 and 12 percent of all school-age children may have Attention Deficit Hyperactivity Disorder (ADHD) making it the most common childhood neurobehavioral disorder.
All effective treatment must begin with an accurate well-established diagnosis. That’s why the AAP has released new standardized diagnostic guidelines for primary care physicians.”
http://www.aap.org/mrt/factsda.htm