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Call for calibration standard for newborn screening using auditory brainstem responses.

John D Durrant¹, Diane L Sabo, Rafael E Delgado

¹Department of Communication Science and Disorders, University of Pittsburgh, Pittsburgh 15260, USA. durrant@pitt.edu

International Journal of Audiology

|November 6, 2007

Summary

Accurate calibration of auditory brainstem response screening devices is crucial for detecting all congenital hearing loss. Current calibration methods need further validation to ensure reliable newborn hearing screening outcomes.

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Area of Science:

Audiology
Neonatal Medicine
Biomedical Engineering

Background:

Auditory brainstem response (ABR) screening for newborns has evolved in stimulation modes, from supraaural earphones to insert and circumaural earphones.
The development of specialized earphones for newborn screening necessitates standardized calibration procedures.

Purpose of the Study:

To assess the need for a standardized calibration method for auditory brainstem response screening devices used in newborns.
To evaluate the reliability of current calibration methods and their impact on detecting mild hearing loss.

Main Methods:

Bench testing of sound output from transducers of two commercial automated newborn screening instruments.
Utilized various measurement approaches, though none specifically modeled the newborn ear.

Main Results:

Manufacturers' calibration methods show potential for simplicity and reliability.
Concerns identified regarding sound output levels when measured by both manufacturers' and authors' methods.
Existing calibration approaches lack a specific model of the newborn ear.

Conclusions:

Further research is essential to critically evaluate ABR calibration methods for newborn screening.
Establishing appropriate norms and validation studies in newborns is needed to understand the actual sound pressure levels of screening stimuli.
Improved calibration standards are vital to prevent missing milder degrees of congenital hearing loss.