- Pure tone threshold average across 500, 1000, and 2000 Hz that is greater than 30 dB.

- Or any hearing threshold greater than 35 dB at 500, 1000, and 2000 Hz.

- Or any hearing threshold greater than 45 dB at 3000 Hz or 55dB at 4000 Hz.

Interpretation of the post-traumatic audiogram is facilitated by review of a baseline audiogram, if available.