What volume range indicates cerumen impaction on a type B tympanogram?

A type B tympanogram indicates a flat response, which typically suggests that there is an obstruction in the middle ear, such as fluid, mass, or cerumen (earwax). Cerumen impaction is one of the most common reasons for a type B tympanogram, as it can block sound transmission through the ear canal to the tympanic membrane.

When evaluating a tympanogram, the volume measurement is crucial in determining the reason for the flat response. In cases of cerumen impaction, the volume typically ranges around 1 mL. This volume indicates that there is significant obstruction preventing normal mobility of the eardrum, as seen in a type B pattern. In contrast, a volume around 0 would suggest a completely sealed ear canal, whereas higher volumes like 2 or 3 may indicate a different issue, such as a perforation or profound middle ear disease.

In summary, the volume around 1 on the scale is indicative of cerumen impaction because it reflects the level of obstruction in the ear canal while still falling within a potential range that allows for some measurement of ear canal volume without it being completely blocked.