The OSHA Form 300 is used to document all workplace illnesses and injuries. Hearing loss caused or aggravated by workplace noise is a workplace illness when the following conditions apply:
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The current hearing test shows:
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Average thresholds of >25dB at 2KHz, 3KHz and 4KHZ relative to audiometric zero, in either ear, and in the same ear
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Average change of >10dB at 2KHz, 3KHz and 4KHZ compared to the baseline, in the same ear
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2. Workplace noise caused or contributed to the average change in hearing. This can be determined through a thorough Work Relatedness Evaluation