Background: Temporary conductive hearing loss due to vernix accumulation in the external ear canal may lead to a false-positive result in newborn hearing screening tests. The aim of this study was to evaluate whether ear examination and intervention may reduce the false-positive rate prior to hospital discharge.
Methods: A case series of 42 newborns who failed initial otoacoustic emissions screening were studied in our institution between May and December 2020.
Results: During the study period, a total of 735 neonates (1470 ears) were screened by otoacoustic emissions in our hospital. Forty-two newborns who failed otoacoustic emissions were included in our study. They constituted 3.9% (n=58 ears) of the total number of ears screened. Forty-four ears (75.9%) passed and 14 ears (24.1%) failed otoacoustic emissions rescreening performed shortly following vernix cleaning. Twelve of the remaining 14 ears passed at 10-day rescreening. The remaining 2 ears presented true bilateral hearing loss. During the study period, the general false-positive rate decreased from 56/735 (7.61%) to 12/735(1.63%) (P < .00001).
Conclusion: Cleaning the vernix of infants who failed otoacoustic emissions prior to hospital discharge lowers the false-positive rate of universal neonatal hearing screening. We may assume that vernix cleaning will reduce significant healthcare workload, costs of unnecessary investigations, as well as parental anxiety.