Impedanceometry: what it is, what it is for and how it is done

Impedanceometry, or immitanciometry, is an exam used to identify changes in the functioning of the ear and consists of measuring the vibration of the tympanic membrane and evaluating the acoustic reflex.

When impedanciometry is altered, it may be a sign of accumulation of secretions in the ear, perforation of the tympanic membrane, sequelae of infections or injuries to the nervous system, for example.

In case of changes in impedance measurement, it is recommended to consult an otorhinolaryngologist. Other tests may be necessary to confirm the cause of the changes and indicate the most appropriate treatment, which may involve antibiotics, hearing aids and/or surgery.

What is it for

A impedanciometria serve para:

• Confirm whether there is an accumulation of secretions in the ear;
• Identify perforations in the tympanic membrane;
• Check for sequelae of ear infections;
• Detect changes in the movement of the middle ear bones;
• Assess the reflex that protects the ear from very loud sounds.

This exam is normally recommended by an otorhinolaryngologist in case of hearing loss and helps the doctor identify the cause of hearing changes and define the most appropriate treatment.

Make an appointment with the nearest otorhinolaryngologist, using the following tool, to assess the need for impedance testing:

Difference between tonal or vocal audiometry and impedanciometry

Tonal or vocal audiometry is an exam that assesses a person’s ability to interpret sounds and words. Impedanciometry assesses the functioning of the ear, not directly indicating whether the person’s hearing is normal. Understand better what audiometry is and what it is for.

Preparation for the exam

No special preparation is required before performing impedance analysis. However, as excess wax obstructing the ear canal can interfere with the result, the doctor may recommend that the ears be cleaned before the exam. See how to clean your ears.

How it is made

Impedanciometry is performed by a specialized speech therapist using an instrument called an impedanceometer, which has a probe capable of emitting sounds and recording the intensity of vibration of the tympanic membrane.

The test takes a few minutes and is carried out in one ear at a time while the person is sitting. It is important to remain still during the test and avoid talking, swallowing, coughing or laughing so as not to interfere with the result.

During the test, the impedance meter probe is placed in the person’s ear canal, like a plug, and it is common to feel slight pressure in the ear and hear some sounds while the device records the information automatically.