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Rinnes and Webers Tests for Hearing Loss | ENT
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1. Place a vibrating 512 Hz tuning fork firmly on the mastoid process (apply pressure to the opposite side of the head to make sure the contact is firm). This tests bone conduction.
2. Confirm the patient can hear the sound of the tuning fork and then ask them to tell you when they can no longer hear it.
3. When the patient can no longer hear the sound, move the tuning fork in front of the external auditory meatus to test air conduction.
4. Ask the patient if they can now hear the sound again. If they can hear the sound, it suggests air conduction is better than bone conduction, which is what would be expected in a healthy individual (this is often confusingly referred to as a “Rinne’s positive” result).
Interpretation of Rinne’s test
In healthy patients, air conduction (using the structures in the ear) should be better than bone conduction (conduction of vibrations via bone). Therefore, the patient should be able to hear the tuning fork held over the external auditory meatus (which is testing air conduction) for longer than the tuning fork held on the mastoid (testing bone conduction).
If there is a problem with air conduction (i.e. conductive hearing loss), then bone conduction may be better than air conduction. In this situation, the patient will be able to hear the tuning fork for longer when held on the mastoid (testing bone conduction) than when held over the external auditory meatus (testing air conduction).
However, a patient with significant sensorineural hearing loss may have a ‘false negative’ Rinne’s test, as they are unable to hear anything in the affected ear but bone vibrations may be transmitted to the unaffected ear.
Explain to the patient that you are going to test their hearing using a tuning fork.
1. Tap a 512Hz tuning fork and place in the midline of the forehead. The tuning fork should be set in motion by striking it on your knee (not the patient’s knee or a table).
2. Ask the patient “Where do you hear the sound?”
A 512Hz tuning fork is used as it gives the best balance between time of decay and tactile vibration. Ideally, you want a tuning fork that has a long period of decay and cannot be detected by vibration sensation.
Interpretation of Weber’s test
Weber’s test should be assessed in context with the results of Rinne’s test before any diagnostic assumptions are made:
Normal: sound is heard equally in both ears.
Sensorineural hearing loss: sound is heard louder on the side of the intact ear.
Conductive hearing loss: sound is heard louder on the side of the affected ear.*
*In conductive hearing loss, there is a relative improvement in bone conduction on the affected side. The affected ear has less environmental noise (due to the problem with air conduction). In addition, low-frequency sounds are ‘trapped’ within the inner ear by the obstruction leading to increased loudness in the affected ear. You can demonstrate this by speaking/humming, and then occluding an external auditory meatus. You will notice your voice is louder in the occluded ear.
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