RECD Audiology Fitting: Real Ear to Coupler Difference

What is the Real Ear to Coupler Difference (RECD)?

RECD serves as a useful tool employed during Real Ear Measurements (REM). It determines the acoustical difference between a real ear canal and a standardized coupler, often a 2cc coupler. This measurement offers invaluable insights into the validation of hearing aids for all patients. Its significance is particularly pronounced in cases involving pediatric patients, where its utility truly shines.

Hearing Instrument Fitting Box

The Measure HIT box is your all-in-one solution for evaluating, fitting, and verifying hearing devices, regardless of their manufacturer. Not only does it meet the stringent industry standards set by IEC and ANSI, but it's also fully compatible with Noah. Additionally, it offers RECD (Real-Ear-to-Coupler Difference) measurements, ensuring accurate and individualized fittings. With the user-friendly Measure Software and a consistent interface for all Measure components, customizing stimuli and prescriptive targets to suit individual needs has never been easier.

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Portable Loudspeaker System

The LS mini is a state-of-the-art portable loudspeaker system, meticulously designed for optimal REM (Real-Ear Measurement) and RECD (Real-Ear-to-Coupler Difference) capabilities. As a part of the Measure series, the LS Mini embodies elegance in a compact form. Its high-end MDF enclosure, characteristic of premium loudspeaker systems, is beautifully complemented by finely sanded and anodized aluminum. This fusion not only makes it aesthetically pleasing but also ensures superior sound quality.

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Why use Real Ear to Coupler Difference for Hearing Aid Fittings?

RECD is particularly valuable when working with pediatric patients. Children have smaller ear canals and different resonance patterns than adults, making personalized adjustments crucial for their hearing aid success. Traditional REM measures, however, can be difficult to complete as the child would be asked to sit still for longer periods of time. RECD helps audiologists tailor hearing aids to the unique needs of young patients, optimizing their auditory development.
By adjusting the hearing aid's frequency response based on RECD data, audiologists can ensure that speech sounds are amplified and delivered effectively, leading to better communication outcomes. Additionally, when considering the dimensions of a patient's ear canal, it becomes possible to effectively eliminate feedback issues.
By having a patient’s RECD data on record, you eliminate the need to test updated hearing devices on the patient’s ear. Simply perform REMs in the test box when convenient and you’re ready to dispense a new hearing aid without a lengthy fitting appointment.

How to Employ (RECD) Values

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.

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