Hearing Aid Verification & Validation Flashcards

Which prescriptive fitting formula is widely used for adult hearing aid verification targets?

Answer: NAL-NL2 (National Acoustic Laboratories Non-Linear 2)

NAL-NL2 is one of the most widely used prescriptive formulas for adult hearing aid fitting, calculating frequency-specific gain targets to maximize speech intelligibility while maintaining comfortable overall loudness.

The International Outcome Inventory for Hearing Aids (IOI-HA) assesses patient outcomes across how many domains?

Answer: 7

The IOI-HA is a validated 7-item questionnaire covering daily use, benefit, residual activity limitations, satisfaction, residual participation restrictions, impact on others, and quality of life.

The Real Ear Unaided Response (REUR) measures:

Answer: The natural sound pressure resonance of the open, unaided ear canal

REUR captures the natural acoustic resonance of the individual's open ear canal without any hearing aid present, establishing a baseline before amplification is introduced.

The International Speech Test Signal (ISTS) is used during hearing aid verification to:

Answer: Provide a standardized, speech-shaped input signal for real ear and electroacoustic measurements

The ISTS is a multilingual, speech-spectrum signal used as a standardized input to verify hearing aid performance under conditions that closely resemble real-world speech.

ANSI S3.22 is the standard that governs:

Answer: Electroacoustic measurement specifications and tolerances for hearing aids

ANSI S3.22 specifies the standardized test methods, measurement conditions, and allowable tolerances for electroacoustic characteristics of hearing aids.

Real Ear Insertion Gain (REIG) is calculated by:

Answer: Subtracting the REUR from the REAR (REAR − REUR)

REIG equals REAR minus REUR, representing the actual gain the hearing aid inserts at the eardrum relative to the natural unaided ear canal resonance.

Output Sound Pressure Level at 90 dB SPL (OSPL90) is verified during hearing aid fitting primarily to:

Answer: Ensure the maximum output does not exceed the patient's loudness discomfort levels

OSPL90 defines the hearing aid's maximum output, and verifying it against the patient's loudness discomfort level (LDL) prevents inadvertent over-amplification that could cause discomfort or harm.