Pure Tone Average (PTA)

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The average of the air conduction thresholds of the three middle frequencies, usually 500 Hz, 1000 Hz, and 2000 Hz. For flat or gently-sloping shaped hearing losses, the Pure Tone Average often correlates with the Speech Reception Threshold. Sometimes the average includes other combinations of frequencies (i.e., a high frequency average may include 3000 Hz or 4000 Hz).