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Appendix 3: Calculation tables for diagnoses
5. SAL INDEX
The SAL Index (Speech Average Loss) evaluates the
conversational frequencies (500, 1000 and 2000 Hz) and is
defined as the arithmetic mean of hearing loss in decibels of
these frequencies. It establishes a classification by degrees
A-B-C-D-E-F-G from SAL-A (both ears are within normal limits)
to SA-G (complete deafness).
Once this value has been obtained, Table 5 of the SAL Index
is used to present the evaluation.
To arrive at the index, both ears need to be tested.
Clinical recommendations have led us to change the text of the
SAL Index Table of the Protocol for Specific Health Surveillance
(Interterritorial Council of the Spanish National Health System)
according to the following:
Grade C changes from “Slightly worse” to “Slight Hearing
Impairment”
Grade D changes from “Seriously worse” to “Significant Hearing
Impairment”
Grade E changes from “Severely worse” to “Serious Hearing
Impairment”
Grade F changes from “Extremely worse” to “Severe Hearing
Impairment”
Grade F covers 91 to 99 dB and Grade G applied to 100 dB
onwards.
There are some situations not covered by the evaluation table,
particularly where impairment is too asymmetric, (one ear
within the normal range but the other however displays serious
acoustic trauma). This occurs when the best ear presents a
drop of <16 dB and the worst ear presents >30 dB. In such
cases, the following text is displayed:
“Detected deafness too asymmetric to be evaluated using the
SAL table”.