![]() The intensity ranges from -10dB HL to 120dB HL.The frequency range for a PTA is 250 Hz to 8000Hz as this range of frequencies is similar to the range important for speech understanding. An audiogram is a plot of frequency in Hertz (Hz) against intensity measured in decibels hearing level (dB HL).Central hearing loss refers to everything in the auditory cortex (Brain) whereas peripheral hearing loss is the result of everything before the brain (outer, middle, inner ear).Mixed hearing loss is a combination of dysfunction in middle/outer ear and cochlea/8th nerve (A certain amount of AC and BC loss). ![]() SNHL is a result of cochlea damage (sensory) and/or neural (8th nerve) (BC = AC).CHL is a result of dysfunction in the middle or outer ear (BC >AC).If soundlateralises to ear without loss=SNHL or mixed hearing loss (MHL) as the best cochlea is detecting the signal.If sound lateralises to ear with loss= CHL as the improved BC is due to the occlusion effect.The tuning fork is placed midline on the patients’ forehead.Test of lateralisation and therefore may be used for patients who report unilateral hearing loss.Rinne Negative: Tuning fork is louder on mastoid= conductive hearing loss (CHL).Rinne Positive: Tuning fork is louder via AC= sensorineural hearing loss (SNHL).Tuning fork is alternated between entrance of ear canal and mastoid process.Comparison of air conduction (AC) and bone conduction (BC) sensitivity. ![]() Provides preliminary diagnostic information. The British Society of Audiology produced a detailed procedure for ear examination. Please note an audiologist/AVM/ENT will send a summary/copy of the basic investigations below to you after the assessment has taken place.
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