A definitive diagnosis of auditory neuropathy is based on electrophysiological criteria combined with functional auditory assessments.
Common diagnostic criteria include:
- Presence of normal or near-normal Otoacoustic Emissions (OAE) (or cochlear microphonics), indicating preserved outer hair cell function.
- Absent, markedly abnormal, or poorly synchronized Auditory Brainstem Responses (ABR), typically characterized by the absence of Wave V or other clearly identifiable waves.
- Poor performance on complementary tests, such as Middle Ear Muscle Reflex (MEMR) assessment or speech perception in noise.
- Comprehensive medical, genetic, and imaging evaluations (MRI in selected or suspicious cases), when indicated, to exclude alternative etiologies and to localize the site of lesion.
Accurate identification of the site of dysfunction (pre-synaptic, synaptic, or post-synaptic) can facilitate the selection of more appropriate and targeted intervention strategies.
