For hearing screening, the main tests are electrical audiometry, acoustic conductance and auditory evoked potentials, if the hearing screening is done for infants, otoacoustic emission is required, and the price of this test is generally around 150-200 RMB for electrical audiometry and acoustic conductance. If it is an auditory evoked potential, it is usually around 150 RMB. Depending on the hospital, the price of otoacoustic emission varies from 10-100 RMB. Generally speaking, otoacoustic emission and auditory evoked potentials are mainly to see if the patient’s auditory nerve is well-developed and whether there is any damage. Electroaudiometry is to see if the patient has a hearing loss and what type of hearing loss it is. Acoustic conductance testing is done to see if there are problems with the middle ear and if there are abnormalities in the function of the eustachian tube.