Auditory tiredness is identified and measured using the tone decay test, sometimes referred to as the threshold tone decay test or TTDT.
A tone that is just a little bit louder than someone's absolute threshold of hearing can be heard continuously for 60 seconds in someone with normal hearing. The result of the tone decay test is a measurement of the "decibels of decay," or the amount of noise beyond the patient's absolute hearing threshold that must be present for the tone to be audible for 60 seconds. Cochlear hearing loss is indicated by a decay of between 15 and 20 decibels, while vestibulocochlear nerve injury is indicated by a decay of over 25 decibels.The patient will be instructed to unwind in a recliner while wearing headphones. The patient will be exposed to a tone at a frequency of 4000 Hertz for 60 seconds at a level that is 5 dB above their absolute hearing threshold. The intensity level is increased by an additional 5dB if the patient stops hearing the tone before the 60-second mark. The process will be repeated until the tone can be heard for the full 60 seconds at that decibel level. If no decibel level can be discovered where the tone can be heard for the full 60 seconds, the highest intensity will be recorded. Decibels of decay are thus used to represent the outcome measurement.

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