What Must Be Recorded on Form 300?

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:

1. The current hearing test shows:

   • Average thresholds of >25dB at 2KHz, 3KHz and 4KHZ relative to audiometric zero, in either ear, and in the same ear

• • Average change of >10dB at 2KHz, 3KHz and 4KHZ compared to the baseline, in the same ear

2. Workplace noise caused or contributed to the average change in hearing. This can be determined through a thorough Work Relatedness Evaluation