Journal of the Medical Association of Thailand Vol 91, No 7:JULY 2008 0125-2208 91 7 2008 Jul Evaluation of Noise-Induced Hearing Loss with Audiometer and Distortion Product Otoacoustic Emissions 1066 EN Viraporn Atchariyasathian Satit Chayarpham Suchada Saekhow Original Article To compare the results of audiogram and distortion product otoacoustic emissions (DPOAEs)parameters between staffs working in a noisy environment and normal subjects. Hearing function of 32 noise-exposed workers and 18 reference subjects were assessedwith DPOAEs and pure-tone audiometry. Results were compared among three groups: 1) ears of referencesubjects, 2) audiometrically normal ears of noise-exposed subjects, and 3) audiometrically abnormal ears ofnoise-exposed subjects. DPOAEs parameters, statistically significant difference were found between group 1 and 2 and group1 and 3 at all frequencies. Statistically significant differences in pass rate for DPOAEs at 4-6 kilohertz (kHz)were also found between group 1 and 2. DPOAEs are more sensitive than audiometry to detect pre-symptomatic inner ear damage. It mayplay a role as screening and monitoring test for noise-exposed workers. Otoacoustic emissions Occupational health