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In addition to the
dB HL scale, there exists two additional dB scales that play a role in
the basic assessment of an individual's hearing. The first of these is
referred to as the Sensation Level (or SL) scale. The reference point
for this scale is the individual's actual pure tone threshold. This scale
becomes useful when we need to assess some aspect of our patient's auditory
capabilities at a specific level above their individual threshold.
The final dB scale
of interest to us from a clinical perspective is the Effective masking
Level or EM scale. We will address this dB scale in a subsequent tutorial.
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