Tuning Fork Tests
Tuning Forks in Use
• 128Hz, 256Hz, 512Hz, 1024Hz, 2048Hz, 4096Hz
• Lower frequency • Bone vibration
• Higher frequency• Shorter decay time
• Not preferred
Clinically Useful Tests
• Rinne Test
• Weber Test
• Absolute Bone Conduction (ABC) Test
• Schwabach’s Test
• Bing Test
• Gelle Test
Rinne Test
• AC compared with BC
• Positive• Normal
• Sensorineural deafness
• Negative• Conductuve deafness
• False Negative• Severe unilateral sensorineural deafness
Weber Test
• Normal• Heard equally in both ears
• Conductive Deafness• Lateralised to worse ear
• Sensorineural Deafness• Lateralised to better ear
Absolute Bone Conduction Test
• Patient’s BC compared with examiner’s BC
• Normal• Same duration
• Conductive Deafness• Same duration
• Sensorineural Deafness• Shorter duration
Schwabach’s Test
• Patient’s BC compared with examiner’s BC
• Normal• Same as examiner’s
• Conductive Deafness• Lengthened
• Sensorineural Deafness• Shortened
Bing Test
• Bone conduction
• Effect of occlusion of ear canal on hearing
• Positive• Normal
• Sensorineural deafness
• Negative• Conductive deafness
Gelle’s Test
Bone conduction
Effect of increased air pressure in ear canal on hearing
Positive Normal Sensorineural deafness
Negative Ossicular chain fixed or disconnected
Thank you