It is estimated that Vietnam has more than 39,000 deaf children, of whom 15,500 children aged 0-6 are deaf or hard of hearing, with little access to preschool education. Screening for congenital deafness is more important than ever.

There are many causes of deafness that are either congenital or develop during childhood. However, it is not always possible to determine the cause of the condition. Sometimes tests are needed to try to find the cause of congenital deafness in a child, but in reality, the cause will only be determined in 40–50% of children with congenital deafness.