Hearing screening programs have found the initial testing to cost between $10.20 and $23.37 per baby, depending on the technology used.[23] As these are screening tests only, false positive results will occur. A review of hearing screening programs found varied initial referral rates (screen positive results) from 0.6% to 16.7%. The highest overall incidence of hearing loss detection was 0.517%.[23] A significant proportion of screen positive infants were lost to follow-up, before a diagnosis could be confirmed or ruled out in all screening programs.[23]