What is a pure-tone average?

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.

What is a pure-tone average and how do audiologist and ENT doctors use it?

A Pure Tone Average (PTA) refers to the average of hearing threshold levels at a set of specified frequencies: typically 500, 1000, 2000 and 4000 Hz. This value gives a snapshot of an individual’s hearing level in each ear.

What is the relationship between SRT and PTA?

The speech recognition threshold (SRT) is believed to be related primarily to the pure-tone average (PTA) and the steepness of the hearing loss. However, there are indications that it may also be influenced by perceptual or cognitive-linguistic factors, or both, such as meaningfulness of the speech stimuli.

Why are pure tones used to determine hearing sensitivity?

When assessing a patient, pure tone tests are carried out on each ear. This enables the HCP to assess individual hearing loss. As well as identifying a loss of hearing function in one or both ears, a pure tone audiometry test highlights the type of hearing loss and the severity of hearing loss.

What is Fletcher average?

The Fletcher average is the average of the two lowest pure-tone thresholds at octave frequencies between 0.5 and 2-kHz. This average is often used in lieu of the pure-tone average when there is a greater than 20 dB difference between two adjacent frequencies in the pure-tone average (Fletcher, 1950).

How do you find the pure tone average?

Hearing sensitivity within the speech frequencies is known as the pure-tone average (PTA) and can be calculated by adding the thresholds obtained at 500, 1000, and 2000Hz and dividing the result by 3.

What is audiology SRT?

An audiologist may do a number of tests to check your hearing. Speech testing will look at how well you listen to and repeat words. One test is the speech reception threshold, or SRT. The SRT is for older children and adults who can talk. The results are compared to pure-tone test results to help identify hearing loss.

How do you find pure tone average?

What is the presentation level of SRT?

The most popular approach is to set the presentation level at a particular SL above the speech recognition threshold (SRT). Martin and Morris (1989) noted that over half of the 74\% of audiologists who used a single presentation level chose a level of 40 dB SL re SRT, while 30\% used a level of 30 dB SL re SRT.

What is a normal word recognition score?

100\%
Normal results would include air and bone thresholds of 25 dB or better, an MCL of approximately 50 dB, a Speech Reception Threshold of around 15 dB, a Word Recognition Score of 100\% and type-A tympanometry.