Yes, you are right, you should not get the diagnosis of CAPD without an audiology exam. My son has a global and auditory processing disorder- but he is hearing impaired. He is deaf in one ear. For 3 years in a row, they said his hearing was normal at the pediatrician's office, but I asked for an audiology exam.
I always like to mention that since I think hearing loss in kids is alot more common than people realize. My son is doing great now, two years later; he has a great hearing aid and uses an FM system in school.
