NATIONAL BOARD FOR CERTIFICATION IN HEARING
INSTRUMENT SCIENCES (NBS-HIS) VERIFICATION
AND VALIDATION CROS EXAM STUDY QUESTIONS
LATEST 2025 GUIDE.
1. Which of the following require subjective responses?
Correct Answer: COSI and APHAB
Explanation: Both the Client Oriented Scale of Improvement (COSI) and
Abbreviated Profile of Hearing Aid Benefit (APHAB) are subjective validation
tools that rely on patient feedback to assess perceived hearing improvement.
2. When performing Real-Ear Measurements (REM), your equipment must
be:
Correct Answer: Calibrated
Explanation: Accurate and reliable REM requires calibrated equipment to
ensure the sound levels delivered and measured are valid.
3. Otoacoustic Emissions (OAEs) are generally performed on:
Correct Answer: Infants
Explanation: OAEs are used for newborn hearing screening because they
are quick, objective, and do not require a behavioral response, making
them ideal for infants.
4. The difference between REAR and REUR is best known as:
, Correct Answer: Functional gain
Explanation: Functional gain is the difference between the Real-Ear Aided
Response (REAR) and the Real-Ear Unaided Response (REUR), showing
the benefit provided by the hearing aid.
5. In REM, the latest technology can measure performance based on
which of the following?
Correct Answer: RECD – Real-Ear to Coupler Difference
Explanation: RECD allows clinicians to predict real-ear responses using
test box equipment, especially useful in pediatrics or when REM cannot be
performed directly.
6. During sound field testing, the devices should be worn at:
Correct Answer: MCL – Most Comfortable Loudness
Explanation: To obtain valid speech recognition or aided thresholds in the
sound field, testing should be done at the patient's most comfortable
listening level (MCL).
7. A key benefit of conducting live speech mapping is to measure
performance characteristics of:
Correct Answer: Directional microphones
Explanation: Live speech mapping allows clinicians to observe hearing aid
behavior in real-time, including how directional microphones respond to
speech from various locations.
INSTRUMENT SCIENCES (NBS-HIS) VERIFICATION
AND VALIDATION CROS EXAM STUDY QUESTIONS
LATEST 2025 GUIDE.
1. Which of the following require subjective responses?
Correct Answer: COSI and APHAB
Explanation: Both the Client Oriented Scale of Improvement (COSI) and
Abbreviated Profile of Hearing Aid Benefit (APHAB) are subjective validation
tools that rely on patient feedback to assess perceived hearing improvement.
2. When performing Real-Ear Measurements (REM), your equipment must
be:
Correct Answer: Calibrated
Explanation: Accurate and reliable REM requires calibrated equipment to
ensure the sound levels delivered and measured are valid.
3. Otoacoustic Emissions (OAEs) are generally performed on:
Correct Answer: Infants
Explanation: OAEs are used for newborn hearing screening because they
are quick, objective, and do not require a behavioral response, making
them ideal for infants.
4. The difference between REAR and REUR is best known as:
, Correct Answer: Functional gain
Explanation: Functional gain is the difference between the Real-Ear Aided
Response (REAR) and the Real-Ear Unaided Response (REUR), showing
the benefit provided by the hearing aid.
5. In REM, the latest technology can measure performance based on
which of the following?
Correct Answer: RECD – Real-Ear to Coupler Difference
Explanation: RECD allows clinicians to predict real-ear responses using
test box equipment, especially useful in pediatrics or when REM cannot be
performed directly.
6. During sound field testing, the devices should be worn at:
Correct Answer: MCL – Most Comfortable Loudness
Explanation: To obtain valid speech recognition or aided thresholds in the
sound field, testing should be done at the patient's most comfortable
listening level (MCL).
7. A key benefit of conducting live speech mapping is to measure
performance characteristics of:
Correct Answer: Directional microphones
Explanation: Live speech mapping allows clinicians to observe hearing aid
behavior in real-time, including how directional microphones respond to
speech from various locations.
