Temporal Bone Trauma

The air conduction average at 500, 1kHz, 2kHz are averaged to determine the degree of hearing loss. 

Degree of Hearing Loss:

Normal                                     </= 25 dB

Mild Hearing Loss                      26-45 dB

Moderate                                 46-60 dB

Moderate to Severe                  61-75 dB

Severe                                      76- 90 dB

Profound                                  >/=91 dB

Conductive Hearing Loss - Normal bone conduction threshold, air conduction threshold is higher than 25dB

Sensorineural Hearing Loss - Both bone and air conduction thresholds are higher than 25 dB and that the difference is within 10 dB

Mixed Hearing Loss - Both bone and air conduction thresholds are higher than 25dB and that the difference is greater than 10 dB