Table 2.

A quick reference of the procedures and correction factors related to the real-ear assessment and fitting of hearing aids

Procedure	Primary Clinical Purpose
REUG	To establish a reference for REIG calculation (the UG is subtracted for the AG).
REOG	To determine the extent of slit leak, if sound is passing through the vent as desired, and to assure that vent resonance is not excessive.
REAG	To verify prescriptive targets (e.g., when using DSL4.1) or to calculate the REIG (AG minus UG = IG). Also for verification of hearing aid features.
REIG	To verify prescriptive targets (e.g., NAL-NL1, FIG6), and for verification of hearing aid features.
RESR	To assure that the real-ear output of the hearing aid for high inputs is safe and comfortable.
RECD	To select appropriate 2-cc coupler output and predict aided maximum output in the real ear based on 2-cc coupler findings (OSPL90 + RECD is the predicted RESR).
REDD	To convert from dB HL to ear canal SPL for establishing REAR targets (RECD + RETSPL = REDD).
TEREO	To predict output in the real ear (REAR) when the output in the 2-cc coupler is known (TEREO = RECD + MLE).
CORFIG	To calculate desired 2-cc coupler gain when desired REIG is known (REUG - RECD + MLE = CORFIG).
RETSPL	To convert from dB HL to 2-cc coupler for insert earphones, to 6-cc coupler for supra-aural earphones.