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Newborn Screening Ontario
Expanded Hearing Screening

Hearing Loss Risk Factors

There are 3 main risk factors for congenital hearing loss:

  1. Genetic (inherited) factors account for ~50% of hearing loss present at birth (congenital) with autosomal recessive hearing loss accounting for the majority of these.  
    • Autosomal recessive hearing loss is inherited from both parents – often with no one else in the family having hearing loss, including the parents.
  2. Non-genetic factors (such as congenital cytomegalovirus infection) account for ~25% of congenital hearing loss.
  3. Other causes, such as severe prematurity, certain syndromes, or other risk factors, account for the remaining ~25%