Pure-tone average

• Pure-tone average (PTA) is the average of hearing sensitivity at 500, 1000, and 2000. This average should approximate the speech reception threshold (SRT), within 5 dB, and the speech detection threshold (SDT), within 6-8 dB.
• If the SRT is significantly better than the PTA, the possibility of pseudohypoacusis should be considered. If the PTA is significantly better than the SRT, the possibility of central involvement should be considered.