IHS Verification and Validation Methods 5 — Questions and Answers
Question 1: Which probe microphone measurement best isolates the contribution of the hearing aid alone, excluding the effects of the ear canal?
- REUG (Real-Ear Unaided Gain)
- REIG (Real-Ear Insertion Gain) (Correct answer)
- REAR (Real-Ear Aided Response)
- REOR (Real-Ear Occluded Response)
Correct answer: REIG (Real-Ear Insertion Gain)
REIG is calculated as REAR minus REUG, isolating the gain added by the hearing aid itself while factoring out the natural ear canal resonance.
Question 2: A 70-year-old patient scores 60% on word recognition testing unaided. After fitting, the aided score is 62%. How should this result be interpreted?
- The fitting is highly successful because the patient improved
- The improvement is likely within test-retest variability and may not represent true benefit (Correct answer)
- The patient needs a cochlear implant referral immediately
- The hearing aid gain should be reduced because scores are too similar
Correct answer: The improvement is likely within test-retest variability and may not represent true benefit
A 2% difference in word recognition score falls within typical test-retest variability (±10–15%), so this does not reliably indicate meaningful aided benefit.
Question 3: Which of the following is the BEST reason to use a live speech mapping approach during real-ear measurement?
- It replaces the need for prescriptive targets
- It allows the patient to see and hear how their voice and surrounding sounds are amplified in real time, enhancing counseling (Correct answer)
- It is more accurate than using calibrated speech signals
- It measures only the occlusion effect
Correct answer: It allows the patient to see and hear how their voice and surrounding sounds are amplified in real time, enhancing counseling
Live speech mapping engages the patient visually and auditorily during the measurement, making the fitting process more transparent and improving counseling effectiveness.
Question 4: When a hearing aid is set to an output exceeding a patient's uncomfortable loudness level (UCL), what is the primary risk?
- The hearing aid battery will drain faster
- The patient may experience loudness discomfort, pain, or rejection of the hearing aid (Correct answer)
- The hearing aid will generate feedback constantly
- The audiogram thresholds will appear worse at the next visit
Correct answer: The patient may experience loudness discomfort, pain, or rejection of the hearing aid
If maximum output exceeds the UCL, patients will experience sounds as uncomfortably loud, leading to rejection of the hearing aid and reduced compliance.
Question 5: What is the purpose of measuring the REUG (Real-Ear Unaided Gain) before inserting the hearing aid?
- To check the audiometer calibration
- To establish the natural resonance of the open ear canal as a baseline for calculating insertion gain (Correct answer)
- To determine the patient's dynamic range
- To measure the acoustic output of the hearing aid receiver
Correct answer: To establish the natural resonance of the open ear canal as a baseline for calculating insertion gain
The REUG captures the natural ear canal resonance (typically peaking around 2700 Hz), which is used as the baseline to calculate how much gain the hearing aid actually inserts.
Question 6: According to best practice guidelines, how often should outcome measures (e.g., APHAB, HHIE) be readministered after initial hearing aid fitting?
- Only at the time of initial fitting
- At follow-up appointments to track patient progress and identify unmet needs over time (Correct answer)
- Every 10 years as part of routine audiological evaluation
- Only when the patient reports a complaint
Correct answer: At follow-up appointments to track patient progress and identify unmet needs over time
Repeating outcome measures at follow-up visits allows the hearing specialist to track changes in perceived benefit, identify lingering difficulties, and adjust the fitting accordingly.
Question 7: Which scenario MOST clearly demonstrates that hearing aid validation has been successfully completed?
- The hearing aid output matches the prescriptive targets on the real-ear measurement screen
- The patient reports that their primary listening goals are met and self-report outcome measures show meaningful improvement (Correct answer)
- The hearing aid passes all ANSI S3.22 electroacoustic specifications
- The audiologist confirms the correct programming settings were saved in the software
Correct answer: The patient reports that their primary listening goals are met and self-report outcome measures show meaningful improvement
Validation is successful when the patient reports that their individualized listening goals are achieved and self-report outcome measures confirm meaningful real-world benefit.
IHS Verification and Validation Methods 5
Which probe microphone measurement best isolates the contribution of the hearing aid alone, excluding the effects of the ear canal?