Tuning fork tests
- 3. Tuning Forks in Use • 128Hz, 256Hz, 512Hz, 1024Hz, 2048Hz, 4096Hz • Lower frequency • Bone vibration • Higher frequency • Shorter decay time • Not preferred
- 5. Clinically Useful Tests • Rinne Test • Weber Test • Absolute Bone Conduction (ABC) Test • Schwabach’s Test • Bing Test • Gelle Test
- 6. Rinne Test • AC compared with BC • Positive • Normal • Sensorineural deafness • Negative • Conductuve deafness • False Negative • Severe unilateral sensorineural deafness
- 8. Weber Test • Normal • Heard equally in both ears • Conductive Deafness • Lateralised to worse ear • Sensorineural Deafness • Lateralised to better ear
- 10. Absolute Bone Conduction Test • Patient’s BC compared with examiner’s BC • Normal • Same duration • Conductive Deafness • Same duration • Sensorineural Deafness • Shorter duration
- 11. Schwabach’s Test • Patient’s BC compared with examiner’s BC • Normal • Same as examiner’s • Conductive Deafness • Lengthened • Sensorineural Deafness • Shortened
- 12. Bing Test • Bone conduction • Effect of occlusion of ear canal on hearing • Positive • Normal • Sensorineural deafness • Negative • Conductive deafness
- 13. 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
- 14. Thank you