It is the standard method of hearing tests that subjectively detect the hearing threshold by giving pure voice at different frequencies. The most common is the ear test. It determines the minimum sound level (hearing threshold) that both ears can hear at different frequencies (250-8000 Hz). The patient is seated in a soundproof cabinet. The sound is emitted to the patient's ear via a headset. When the patient hears the sound, he presses the button in his hand and signals. Thus, the volume level is heard. In this measurement, the level of air and bone hearing is determined.
The audiometric evaluation of the human voice as a stimulus is called speech audiometry.
The test is used to measure the pressure of the middle ear. It is very easy to implement; even babies. There should be no hole in the eardrum for the measurement to be made. The pressure in the middle ear is measured by a probe inserted into the external ear canal. As a result, a graphical and pressure value is obtained.
ABR (Auditory Brainstem Response)
ABR (auditory brainstem response) is the electroencephalographic measurement of the brain waves formed by acoustic warnings by electrodes placed in the head. ABR measures the function of the auditory nerve and the brainstem auditory pathways. It is very valuable in assessing the hearing of babies and young children who cannot cooperate with the standard hearing test. The individual to whom this test is applied should be calm or asleep.
OAE (Otoacoustic Emissions)
Otoacoustic emissions are low acoustic signals produced by hair cells in the inner ear. These signals can be measured by means of a probe placed in the outer ear canal. The test should be performed in a quiet environment and when the patient is calm. It's an objective test. It is especially important for early detection of hearing loss in infants. Therefore, newborn hearing is used for screening tests. It is helpful in the diagnosis of auditory neuropathy with ABR. Another area of use is functional hearing loss.
Electrocochleography is performed by measuring the electrical activity of the auditory stimuli in the inner ear by means of an electrode placed on the promontory or membrane. It's an objective test. The test must be carried out in a quiet environment. Gives valuable information on the diagnosis of hearing loss and the diagnosis of Meniere's disease.
VEMP (Vestibular Evoked Myogenic Potentals)
VEMP is the measurement of the involuntary response of the sound stimulus to the SKM muscle. It is a test that measures saccular and inferior vestibular nerve function. Meniere disease, superior semicircular canal dehiscence syndrome and is helpful in the diagnosis of multiple sclerosis.
The VNG test is a test that records and evaluates the movements of the eyes as a result of visual stimuli or position changes. It is applied by attaching glasses equipped with infrared camera. Gives useful information to evaluate the balance of the inner ear. It is used in the differential diagnosis of Meniere's disease, benign paroxysmal positional vertigo (BPPV) and central nervous system-induced dizziness.
Dynamic posturography is a test that can examine the three systems that provide the balance (inner ear, vision and deep sense) separately and determine which system is the problem of balance problem. While the patient is trying to stand still on a pressure sensitive platform, the degree of body oscillation is measured in 6 different cases and evaluated. Balance exercises are also possible on the device.