Aural Rehabilitation Exam 2 Practice Test

Which tympanometric type corresponds to normal middle-ear pressure and normal mobility?

Type A Type B Type C Type As

Correct Answer:

Type A

Explanation:

Normal middle-ear pressure with normal mobility shows up as a Type A tympanogram. The key idea is a peak in tympanometric compliance near zero daPa, with a normal peak height, indicating both typical middle-ear pressure and normal movement of the eardrum in response to pressure changes. If the trace is flat (no peak), that’s Type B and suggests little to no mobility due to fluid, perforation, or a probe issue. If the peak shifts toward negative pressure (Type C), the middle-ear pressure is negative. A shallow peak with reduced mobility (Type As) means normal pressure but stiffer middle ear, while a tall peak with normal pressure (Type Ad) reflects hypermobility often due to ossicular discontinuity.

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