ABSTRACT
Survery and comparison between the physical characteristics of Distortion-Product Otoacoustic Emissions of 1- 59 day-old normal-hearing newborns refered to TUMS, Rehabilitation School , Audiology department , 2002. This analytical-descriptive study was conducted on the ears of 102 easy method selected newborns. The tests included: otoscopy , BOA, Immittance audiometry , DPOAEs, and ABR if necessary. The amplitude and frequency of 2f[1]-f[2] emissions of DPOAEs evoked by two pure tones [L1=65 dBSPL , L2=50 dBSPL and f2/f1=1.2] were also calculated. All normal hearing newborns have normal DPOAEs. No significant difference was observed in test-retest. The amplitude of the DPOAEs to the right ear is significantly greater than the amplitude of the left ear [P<00.05]. No significant difference was observed between newborn's DPOAEs in terms of their gender. DPOAEs could be measured quickly and noninvasively and are excellent tools for the screening of newborn hearing loss. The results are valid only within the Context of this research