Frequency range definition

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Guidelines on the diagnosis and quantification of NIHL

Guidelines on the diagnosis and quantification of NIHL The primary resource used by medicolegal experts and the courts in the diagnosis of noise-induced hearing loss (NIHL) is the document by Coles, Lutman and Buffin entitled ‘Guidelines on the diagnosis of noise-induced hearing loss for medicolegal purposes’ published in April 2000 (also known as the CLB Guidelines). The same authors wrote further guidelines on the quantification of NIHL and these were published in 2016 as the ‘Guidelines for quantification of noise-induced hearing loss in a medicolegal context’ (also known in the industry as the LCB Guidelines). They were published to overcome the fact that the CLB Guidelines were restricted to diagnosis of NIHL and could not be used for quantification of NIHL. Both guidelines are considered in this Practice Note. This Practice Note also briefly looks at the ‘Guidelines for Diagnosing and Quantifying Noise-Induced Hearing Loss’ published by Moore, Lowe and Cox in 2022 (the MLC Guidelines). The 2000 CLB Guidelines There is the option to purchase the publication from this...

Noise-induced hearing loss—Glossary

Noise-induced hearing loss—Glossary Air conduction (AC) The transmission of sound through the outer and middle ear to the inner ear. The standard audiogram is measuring air conduction. Age-associated hearing loss (AAHL) Also called presbycusis, age-associated hearing loss is primarily related to age and usually affects both ears equally. Air-bone gap (ABG) The figure arrived at by deducting the HTL given by the bone conduction reading from that given by the air conduction reading. Audiogram A pure tone audiogram is a chart of a person’s hearing threshold levels for pure tones at different frequencies, showing loss as a function of frequency, measured using an audiometer. Audiometer Pure tone audiometer—an electroacoustical instrument. For air conduction measurements the audiometer uses a headset with two earphones which provides pure tones of specified frequencies at known sound pressure levels, used to determine hearing threshold levels, one ear at a time. To measure bone conduction the audiometer is also equipped with a bone vibrator. Manual audiometer—an audiometer where the signal presentations, frequency and hearing level selection,...