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Which threshold of hearing is measured by a pure-tone audiometer?

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Which threshold of hearing is measured by a pure-tone audiometer?

(a) air-conduction thresholds of hearing

(b) bone-conduction thresholds of hearing

(c) speech reception thresholds for diagnostic purposes

(d) air-conduction and bone-conduction thresholds of hearing

This question was posed to me during an internship interview.

This intriguing question comes from Mechanism of Hearing topic in division Audiometry of Biomedical Instrumentation

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The correct answer is (d) air-conduction and bone-conduction thresholds of hearing

The best explanation: A pure-tone audiometer is used primarily to obtain air-conduction and bone-conduction thresholds of hearing. Audiometers may be divided into two main groups on the basis of the type of stimulus they provide to elicit an auditory response: pure-tone audiometers and speech audiometers. These thresholds are helpful in the diagnosis of hearing loss.

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