Useful knowledge about the hearing test
The audiogram is a detailed graphical representation of your hearing ability in the form of a hearing curve. Based on the results, the hearing specialist will be able to identify your specific hearing impairment in a simple and quick manner. An ear-nose-throat specialist or any resident acoustician can perform a hearing test in order to assess your auditory perception.
The following contains important information pertaining to hearing tests. We will explain the following: how audiograms work and what the specialist (acoustician) will learn from your test results. Would you like to check your hearing ability? No problem! We can gladly schedule an appointment for a hearing test at one of our partner specialists in your area.
What precisely is an audiogram?
An audiogram records the so-called hearing threshold for various frequencies, which is the range that the human ear is just barely capable of perceiving a sound. A ready-made form is used for this purpose: Pitch is listed horizontally (Frequency in Hz), volume in dB vertically.
The zero line in an audiogram corresponds to the hearing threshold of an adolescent with normal hearing abilities. In the course of the measurement, two distinct values are distinguished. On the one hand, there is air conduction when sound travels from the outer ear via middle ear to the inner ear. This corresponds to what we typically associate with the term “hearing”. In addition, there is bone conduction when vibrations reach the inner ear by mediation of the cranium. In the ear, these signals are normally superposed by air conduction. When this is impaired, however, hearing aids are adaptable in order to take advantage of bone conduction. For this purpose, a much higher volume is necessary (approx. 50 dB more than airborne sound).
Production of an audiogram
First, the patient will put on headphones. Then, the acoustician will play a single tone starting with the frequency of 1000 Hz, which is generally recognizable for healthy ears. The tone will increase in increments of 5 dB until the patient can hear it. Subsequently, the process is repeated with other frequencies, and the respective hearing threshold is noted.
After completing this test on both ears, the patient will put on a bone conduction receiver, which is placed directly on the cranium. Analogous to air conduction, the hearing threshold for bone conduction can be determined. By connecting hearing threshold values in this relative display – separate for each ear – hearing threshold curves for both air and bone conduction are obtained.