Audioscan Verifit - Manual (Page 102)

Verifit ® User's Guide Version 3.12  May 2015
Assessment data choices
The following audiometric assessment parameters can be specified in the Speechmap Audiometry setup box.
Defaults are the last-used choices if test setup memory has been turned on. See Saving test setup.
1. Target: Select fitting targets from [DSL adult, DSL child, NAL-NL1, NAL-NL2 Camfit restoration, Camfit
equalization, None]. See DSL 5.0 in Speechmap, NAL-NL1 in Speechmap, NAL-NL2 in Speechmap, Camfit
in Speechmap.
2. Age: This is permitted for [DSL child] and [NAL-NL2] targets only. Select client’s age in months from [1
months to 60 months] or years from [6 years to 10 years]. For children older than 10 yrs, previously fit using
DSL, choose Adult.
3. HL transducer: Type of audiogram. Select from [Headphone, Insert + Foam or Soundfield]. In addition, if
Target= DSL, you may chose from [Insert + Mold, ABR (eHL), ABR (nHL)]. If Insert + Foam or Mold is
selected, the appropriate RECD will be used to convert entered HL values to SPL values. If Soundfield is
selected appropriate real-ear unaided gain (REUG) values @ 45 degrees azimuth, will be used to convert HL
values to SPL values. If ABR (eHL) is selected, entered thresholds will be treated as behavioral pure tone
thresholds. If ABR (nHL) is selected, nHL to eHL conversion factors may be selected from [Default, Enter].
In either case, an insert earphone is assumed for sound delivery and the appropriate RECD will be applied.
Note that, in some facilities, nHL is defined in such a way that it is effectively eHL; in these cases, ABR
(eHL) should be selected. See ABR nHL to eHL setup and Assessment data choices – 2.
4. Bone conduction: Select from [N/A, Enter]. If [Enter] is selected, an entry screen will be provided after the
air conduction thresholds have been entered.
5. UCL: Uncomfortable Level. Select from [Enter, Average]. If measured UCL values are entered, these values
will be converted to real-ear SPL and used as real-ear saturation response (RESR) targets. Note that DSL 5.0
has changed this term to Upper Limit of Comfort (ULC). Regardless of the acronym, it is a narrow-band SPL
that should never be exceeded.
6. RECD: Select from [DSL Average, Enter, Measure] if the target rule is DSL child or adult, [NL2 Average,
Enter, Measure] if the target rule is NAL-NL2 or [Average, Enter, Measure] otherwise. The RECD is used to
convert entered HL data (thresholds and UCL's) to SPL values on the Speechmap screen (when Insert+Foam
or Insert+Mold is selected as HL Transducer) and to convert coupler SPL measured in the test box to
estimated ear canal SPL. The DSL child and NAL-NL2 fitting rules provide differing age-appropriate
average RECDs which will result in differing SPL thresholds. Estimated ear canal SPL always uses DSL data
when RECD set to average. If Measure is selected, you will be required to measure the client’s RECD values
or accept values from the RECD test. If Enter is selected, HA-2 or HA-1 RECD values may be entered
and are required at all 9 audiometric frequencies. When Enter or Measure is selected, you
will be required to specify the coupling in use between the RECD transducer and ear.
7. RECD Coupling: Select from [Earmold, Foam tip]. Specifies the coupling between the RECD transducer
and ear. A correction will be applied when entering HA-2 referenced RECD data and when measuring with
earmold.
8. Binaural: Select from [Yes, No]. Determines if fitting targets will be adjusted for binaural summation
effects. This is excluded for [DSL child] targets.
9. REDD: Real-ear-to-Dial Difference. [Average] (this cannot be changed). REDD values are similar for adults
and children. If Headphone is selected as the transducer type, adult average values will be used to transform
dB HL audiometry to dB SPL.
10. ABR nHL to eHL: Normalized HL to estimated HL conversion factors. Permitted only if [Transducer] =
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