Cranial
Nerves 8b: Test
of Lateralisation (Weber)
- Use a 512 Hz or 1024 Hz (short) tuning fork. (Not 128 Hz (long)
which is for peripheral neuropathy testing).
- Start the fork vibrating by tapping it on your opposite hand
or patella hammer.
- Place the base of the tuning fork firmly on the patient's forehead.
- Ask the patient where the sound appears to be coming from (normally
in the midline).
- If the sound is louder on one side, interpretation of which
side is abnormal relies on performing Rinne's test.
- It will be louder on the side which in normal if there is sensorineural
deafness on one side.
- It will be louder on the deaf side when there is unilateral
conductive deafness.
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