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.