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Pure tone Audiometery Pure-tone audiometry is a behavioral test used to measure hearing sensitivity. This measure involves the peripheral and central auditory systems. Pure-tone thresholds (PTAs) indicate the softest sound audible to an individual atleast more than 50% of the time. Hearing sensitivity is plotted on an audiogram, which is a graph displaying intensity as a function of frequency. Degrees of hearing loss Normal hearing (0-15 dB): At this level, hearing is within normal limits. Types of Hearing loss Conductive Sensorineural Mixed modalities of tone presentation are air and bone conduction. PTA is gold standard test in diagnostic audiology. Advantages of PTA - Medico-legal Purpose - Qualitative and Quantitative analysis - Pre and post operative comparison
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