Board Certified in Hearing Instrument Sciences (BC-HIS) are those HIS/HAS's who have been dispensing hearing aids for at least 2 years. During that time they have gone through studies and have passed an certification board exam. They are also required to maintain continuing education units during the year.
Audiologist (AuD) is a hearing care professional that have advanced levels of education, either earning a Master's or Doctorate in the field of Audiology. Their course work may include the study of hearing loss, balance disorders, anatomy and physiology, genetics, etc. They are capable of evaluating, diagnosing and treating patients with hearing loss,
tinnitus and balance disorders.