Understanding An Audiology Report

The Purpose of Audiology Reports:

The purpose of an Audiology Report is to help parents, interventionists, and physicians understand an individual’s hearing status.  Sometimes it is difficult for an audiologist to write a report that is meaningful and useful to all three audiences, which can make the report difficult to understand as a parent.  The Wyoming EHDI Program and Child Development Center personnel can help you to better understand your child’s hearing loss and the information on their Audiology Report.

What is an Audiogram? 

  • When hearing is tested, the audiologist keeps track of exactly which tones each ear hears.  Although some audiologists use a different form, most use a standard graph called the audiogram.  The audiogram is a visual picture of what the ear hears. 
  • The vertical lines on an audiogram represent pitch or frequency.  The 125 Hertz (Hz) vertical line on the left side of the audiogram represents a very low pitch sound and each vertical line to the right represents a higher pitch sound.  Moving from left to right on the audiogram would be consistent with moving from left to right on a piano keyboard.  The most important pitches for speech are 500-4000 Hz.
  • The horizontal lines represent loudness or intensity.  The 0 decibel (dB) line near the top of the audiogram represents an extremely soft sound.  Each horizontal line below represents a louder sound.  Moving from the top to the bottom would be consistent with hitting the piano key harder or turning up the volume control on your stereo.
  • The softest sound you are able to hear at each pitch is recorded on the audiogram.  The softest sound you are able to hear is called your threshold.  Thresholds of 0-25 dB are considered normal for adults and thresholds of 0-15 dB are considered normal for children.
  • The X’s on an audiogram represent the left ear and the O’s represent the right ear.

What to Look for in an Audiology Report:

  • Is the report complete?
  • What tests were done?
  • Were the test that were done appropriate for the child?
  • Were there any specific test(s) that should have been done, but were not?
  • Is the diagnosis correct?
  • Does the report address the hearing status of each ear?
  • Are the recommendations consistent with the findings?
  • Are timely follow-up appointments established when necessary?
  • Are referrals made to the appropriate educational facilities?
  • Does the report clearly state the “next step” for the parents?
  • What is an Audiogram? 

Pediatric Audiology Evaluations

Pediatric Audiometric Diagnostic Guidelines

All procedures refer to each ear individually; the numbers below represent the order in which the assessments are completed during testing.

1) Pediatric case history: Screening information, significant medical history, family history of hearing loss, and any parental concerns.

2) Otoscopic evaluation: Observation of the outer ear and external ear canal as feasible.

3) Tympanometry: Information regarding middle ear status; high frequency probe tone should be used in children 6 months or younger. Include acoustic reflex testing. 

4) Otoacoustic emissions (OAE): Can assist in diagnosing normal or abnormal hearing sensitivity, middle ear status, or neural dysfunction.

5) Auditory brainstem response (ABR):

a) Click-evoked ABR at 80 dBnHL Evaluates neural integrity and function; absolute, interpeak (I-III-V), and interaural latencies along with waveform morphology to evaluate neural integrity; reversal of signal polarity to help identify site of pathology. b) Click-evoked ABR threshold search Estimated hearing sensitivity at 2-4 kHz. c) Low and high frequency (tone burst) ABRs Estimated hearing sensitivity at both low and high frequencies; information can assist in selecting and fitting a hearing aid when one is warranted.

6) Auditory steady-state response (ASSR): Provides further frequency-specific information; used to cross-check with the click-evoked and tone burst ABR results.

Additional procedures

If any of the above procedures indicate disorder, additional procedures that need to be completed are:

Pediatric case history: More comprehensive than may have been done initially.

Bone-conduction ABR/ASSR: Establishes the type of hearing loss.

Follow-up procedures

When there is an indication of disorder, the follow-up procedures below need to be conducted at intervals recommended by the pediatric audiologist. The procedures below are appropriate for children who are 6- 8 months of age or older and not exclusive to additional follow-up procedures and/or recommendations identified by the pediatric audiologist.

Visual reinforcement audiometry (VRA): Hearing thresholds to confirm the physiological air-conduction and bone-conduction findings above. Thresholds or pure tone thresholds

Tympanometry: Evaluate middle ear status; low frequency probe tone may be used with children older than 6 months of age.