Diagnosis can be done by these following method.
A. CONDUCTIVE TECHNIQUES:
A. Play audiometry:
The child is conditioned to perform an act such as placing a marble in a box each time he hears a sound signal.
Each correct performance of the act is reinforced with praise, encouragement.
Ear specific threshold can be determined by standard audiometric technique.
B. SPEECH AUDIOMETRY:
Child is asked to repeat the names to certain objects or to point them on pictures.
The voice can be gradually lowered.
Hearing level & speech discrimination can be tested.
B. OBJECTIVE TESTS:
A. Evoked response audiometry:
B. Otoacoustic emissions (OAE):
C. Impedance audiometry: Normally stapedius muscle contracts in response to sound of 70-100dB, hearing loss & this reflex can be recorded.
Absence of acoustic reflex indicates- 1. Middle ear disorder. 2. Retro cochlear hearing loss. 3. Severe to profound SNHL.
Absence of reflex but normal tympanometry- SNHL of severe profound degree.
Absence of reflex but abnormal tympanogram- conductive loss.
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