7 10 06:9:52 AM HEARING TESTS AND MEASUREMENT Audiology and Speech Language Pathology 438 (3 2025

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A typical audiogram measures thresholds at frequencies within a range slightly broader than that of human speech, including 250, 500, 1000, 2000, 3000, 4000, 6000, and 8000 Hz. The primary speech frequencies fall between 500 and 4000 Hz, although normal human hearing ranges from ~20 Hz to ~20,000 Hz.
Pitch or Frequency The frequencies tested are 125 Hz, 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, 3000Hz, 4000 Hz, and 8000 Hz. Examples of low-frequency sounds are a rumble of thunder, a tuba, and sounds like the oo in who. Examples of high-frequency sounds are a bird chirping, a whistle, and the s sound in sun.
Understanding Hearing Loss Levels Mild: 25-40 decibels. Moderate: 41-55 decibels. Severe: 56-70 decibels. Profound: 70+ decibels.
One common result of hearing tests is what is called the pure-tone average for each ear. Those numbers, known clinically as the PTA4 and commonly called the Hearing Numbers , are a measure in decibels of the softest speech sound a person can hear. The higher the number, the lower that persons ability to hear.
ARTs are measured at 500 Hz, 1000 Hz, and 2000 Hz. Testing at 4000 Hz is not recommended because many people with typical hearing have elevated reflexes at this frequency (Gelfand, 1984; Silman Silverman, 1991). Normal ARTs range approximately from 85 dB SPL to 100 dB SPL for pure-tone stimuli (Gelfand, 1984).
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Mild hearing loss is defined as hearing thresholds in the range 26 to 40 dB. Moderate hearing loss is defined as hearing thresholds in the range of 40-55 dB. Moderately-severe hearing loss is defined as hearing thresholds in the range of 56-70 dB.
Speech audiometry involves two different tests: One checks how loud speech needs to be for you to hear it. The other checks how clearly you can understand and distinguish different words when you hear them spoken.

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