Journal article, Real ear measurements, Open fittings
Variability in real ear measurements (REM) is a real issue that can affect the accuracy and practical application of hearing aid fitting verification. This study examined how different types of hearing aid fittings, including the popular open fitting, can affect the variability seen in REM.
Insertion gain measurements were conducted on 20 ears using 5 different conditions – BTEs with standard tubing and custom earmolds, BTEs with thin tubes and open and tulip domes, and RIEs with open and power domes – and 2 different audiologists who measured each condition twice.
None of the variation in REM between the 2 testers, the 5 hearing aid conditions and the 2 test-retest sessions were found to be significant. This shows that REM is reliable in open fittings, as long as care is taken to ensure appropriate REM procedures, especially proper probe tube insertion.