As a teacher I have always been under the impression or had the idea that ADD couldn't really be diagnosed until grade 2. (I am not dealing with ADHD in this question). I was wondering if it can actually be diagnosed younger to the benefit of the child. As well, if it can be how do you find the appropriate doctor to do the test?
There's a push towards diagnosing children earlier, but medication can be problematic so the recommendation is usually to start with parent training and behavior modification programs.
CHADD is an advocacy group for ADHD and they provide a page with resources for finding a doctor. (Their website provides a lot of general info as well). It would not hurt to start with your pediatrician but I think a specialist will be able to provide the best care.
Our youngest was "diagnosed" ADD. Turns out he just has a different learning style and is a little boy whose soul needs motion to be happy. So we pulled him from school and he crushes everything he does. That is as long as he can bounce and be upside-down. He does most of his math in his head while bouncing on a trampoline.
Point: Be very careful about the all-too-quick diagnosis of ADD. What's just starting to really spill out of research is diet is the cause for so much mis-diagnosis. Especially sugar. Second is the starving the brain of the nutrients derived from healthy fats.
I was "diagnosed" ADHD in highschool. They wanted me to go on Ritalin. My parents (thank you!) said no. I was just creative, full of energy, and jacked up on sugar/carbs. Eating a diet high in healthy-fat and low in carbs eliminated my concentration issues.
Before you head off to a doctor you might want to buy a cheap blood glucose monitor and get 30 days of data points to see if there's any correlation to the symptoms of the ADD/ADHD and the blood glucose. When my blood glucose is over 100 I'm a total spaz and can't think straight. I keep my average at 85 which is my sweet-spot for energy and focus. Same for our youngest. Genes. Go figure.
Oh yeah - research what a little caffeine (tea, premium coffee) can do for kids with ADD/ADHD. A KerryGold and caffeine in the morning can be 10x more effective than medication. The fears of giving kids caffeine are myth. Tons of research on it now.