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Official Description

Acoustic reflex testing; decay

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

Acoustic reflex testing, specifically decay testing, is a diagnostic procedure used to evaluate the function of the auditory system. This test measures the changes in impedance, which refers to the resistance to sound, in one ear when a loud sound is introduced to the opposite ear. The primary focus of this testing is to determine how long the impedance change lasts after the loud sound is presented. This information is crucial for assessing the integrity of the auditory pathways and can help identify potential issues related to hearing loss or dysfunction within the auditory system. By analyzing the reflexive response of the ear to sound stimuli, healthcare professionals can gain insights into the health of the auditory system and make informed decisions regarding further evaluation or treatment options.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

Acoustic reflex decay testing is indicated for various conditions and symptoms that may affect auditory function. The following are explicitly provided indications for performing this procedure:

  • Hearing Loss This test is often performed in patients who exhibit signs of hearing loss to assess the functionality of the auditory pathways.
  • Auditory Neuropathy It is indicated for individuals suspected of having auditory neuropathy, where the transmission of sound signals from the inner ear to the brain is impaired.
  • Middle Ear Disorders The procedure may be indicated in cases of suspected middle ear disorders, as it helps evaluate the impedance changes associated with these conditions.
  • Vestibular Disorders Patients with vestibular disorders may also undergo this testing to assess the reflexive responses of the auditory system.

2. Procedure

The procedure for acoustic reflex decay testing involves several key steps that ensure accurate measurement of impedance changes in response to sound stimuli. The following steps outline the process:

  • Step 1: Patient Preparation The patient is positioned comfortably in a quiet environment to minimize external noise interference. An otoscopic examination may be performed to ensure the ear canal is clear and free of obstructions.
  • Step 2: Equipment Setup The audiologist prepares the necessary equipment, including an impedance audiometer, which is used to measure the acoustic reflex. The device is calibrated to ensure accurate readings.
  • Step 3: Placement of Probes A probe tip is inserted into the ear canal of the ear being tested. This probe will measure the changes in impedance as sound is presented. A second probe may be placed in the opposite ear to deliver the loud sound stimulus.
  • Step 4: Presentation of Stimulus A loud sound, typically a tone or click, is presented to the ear opposite the one being tested. The intensity of the sound is set to a predetermined level to elicit a reflexive response.
  • Step 5: Measurement of Impedance Changes The audiometer records the changes in impedance in the tested ear as the loud sound is presented. The duration of the reflex response is measured to assess the decay of the acoustic reflex.
  • Step 6: Data Analysis After the test is completed, the audiologist analyzes the data collected to determine the presence and duration of the acoustic reflex decay. This information is crucial for diagnosing potential auditory system issues.

3. Post-Procedure

After the acoustic reflex decay testing is completed, the patient may be advised to resume normal activities immediately, as there are typically no significant post-procedure restrictions. The audiologist will review the results with the patient, discussing any findings and potential implications for hearing health. If further evaluation or treatment is necessary based on the test results, appropriate referrals or recommendations will be provided. Follow-up appointments may be scheduled to monitor the patient's auditory health and address any ongoing concerns.

Short Descr ACOUSTIC REFLEX DECAY TEST
Medium Descr ACOUSTIC REFLEX DECAY TEST
Long Descr ACOUS RFLX DECAY
APC Status Indicator Ancillary Services
Type of Service (TOS) K - Hearing Items and Services
Berenson-Eggers TOS (BETOS) none
MUE Not applicable/unspecified.
CCS Clinical Classification 220 - Ophthalmologic and otologic diagnosis and treatment
Date
Action
Notes
2010-01-01 Deleted -
2006-01-01 Changed Code description changed.
Pre-1990 Added Code added.
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