Normal Db levels on audiometry
Readings at all frequencies will be between 0 and 20 dB, at the top of the chart.
Sensorineural hearing loss pattern
Both bone and air conduction will be higher than 20dB
Conductive hearing loss
Bone conduction will be normal but air conduction is worsened
Mixed hearing loss
Both air and bone conduction readings will be more than 20 dB in patients with mixed hearing loss.
However, there will be a difference of more than 15 dB between the two (bone conduction > air conduction).
Presbycusis
Worsening of hearing at higher frequencies