Human Hearing 
Most humans hear sounds in the range of 20 to 20,000 Hz. Sensitivity vary as a function of frequency, with sounds in the middle frequencies being heard well. 

HEARING/AUDIOLOGICAL TESTINGS 
PURE TONE AUDIOMETRY / AUDIOGRAM 

• Degree of hearing loss (How much problem).
• Types of hearing loss (Where is the problem).
• To Rule out Retrocochlear and Cochlear pathology. 
  
  

IMPEDENCE AUDIOMETRY (Interaacoustic, Zarmany) 

• To rule out middle ear pathology.
• To rule out cochlear sensitivity loss or VIII nerve disorder.
• Ipsilateral VII nerve lesion.
• Evoked stapedius reflex test for cochlear implant.

SPEECH AUDIOMETRY
Provides information about hearing handicap. Problem maybe worse than indicated by pure tone average (PTA) for the speech frequencies. 

• Useful to determine candidacy for hearing aid.
• A very poor result, out of proportion to PTA, suggests probable retrocochlear cause of hearing loss.
• SRT
• SDT (PBmax100)
• SAT
• UCL

Behavioral Observation Audiometry (BOA) 

• For small children.

Conditioning Audiometry 

• To know aided response.(With hearing aid and cochlear implant)
• For smaller children.

Oto Acoustic Emission (OAE) - (Biologic Company, USA)

• To rule out hearing loss in newborn.
• To rule out inner ear pathology.

Brainstem Evoked Response Potential (BERA) - (Biologic Company, USA) 

• To know site of lesion.
• Fully automatic & computerized test.
• Threshold estimation

Multiple Auditory Steady-State Response (ASSR) - (Biologic Company, USA) 

• Objective Audiometry.
• Fully automatic and computerized

Electrocochleorgraphy (ECochG) - (Biologic Company, USA) 

• Diagnosis of Meniere's disease.
• Differential diagnosis.

Objective and subjective fitting of all companies of digital hearing aid- (Swiss & USA combine technology) 

• Objective fitting gives accurate fitting in children as per earcanal length.
• It care overamplification and prevents further damage due to overamplification.

Mapping & Telemetry 

• Mapping & Telemetry available for all three companies of Cochlear implants.