Actually, there is no clear diagnostic criteria for dysgraphia anywhere. The term simply refers to writing difficulty and typically involves poor handwriting (which is frequently seen with ADHD). If you are concerned that your son may have a learning disability, the best place to have that "diagnosed" is you local public school where they can provide the evaluation at no cost. While you certainly can pay for an evaluation at a private clinic, such clinics typically don't fully understand special education criteria. Good luck.