Hearing screening includes auditory brainstem electrical response test, evoked otoacoustic reflex test, and auditory brainstem electrical response test, which has an accuracy rate of 98% or more if machine and operator problems are excluded. The evoked otoacoustic reflex test can be affected by various factors. If various external factors are excluded, the accuracy rate is no different when compared to the auditory brainstem electrical response. Hearing screening is performed at 48-72 hours after birth, and because there can be residual amniotic fluid in the middle ear of newborns during the first 1-2 days of life, it can affect the recording of the otoacoustic reflex. Failure to pass the hearing screening can be affected by the stability of the testing machine and the fact that the child is not in a quiet state at the time of the screening.