Procedure Tympanometry

tympanograms categorized according shape of plot. normal tympanogram (left) labelled type a. there normal pressure in middle ear normal mobility of eardrum , ossicles. type b , c tympanograms may reveal fluid in middle ear, perforation of tympanic membrane, scarring of tympanic membrane, lack of contact between ossicles, or tumor in middle ear.

the categorising of tympanometric data should not used diagnostic indicator. merely description of shape. there no clear distinction between 3 types, nor 2 subtypes of type a, namely a








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, a








d




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. measures of static acoustic admittance, ear canal volume, , tympanometric width/gradient compared sex, age, , race specific normative data can used accurately diagnose middle ear pathology along use of other audiometric data (e.g. air , bone conduction thresholds, otoscopic examination, normal word recognition @ elevated presentation levels, etc.).