Measured RECD
For both adult and pediatric patients, RECD can be measured. Essentially, a probe tube is inserted into the ear canal, along with an insert headphone, to measure the Sound Pressure Level (SPL). This measured SPL output is then subtracted from the SPL output within a standardized coupler to derive the individual's unique RECD. Once this step is complete, the probe tube can be gently removed from the patient's ear, and a multitude of Real Ear Measurements can be seamlessly conducted with the hearing aid connected to the coupler, utilizing the obtained RECD values.
Standardized RECD
If you’re unable to measure RECD for a particular patient, standardized values, normalized by age, are available. When using these values, measures can be entirely performed off the patient’s ear in a test box using a standardized, often 2cc, coupler. While measured RECD values are ideal, standardized values can not only save time, but are useful when verifying hearing aids for children and other patients who may not tolerate probe tube insertion.