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'''Percussion''' is a method of tapping on a surface to determine the underlying structure, and is used in [[clinical examination]]s to assess the condition of the [[human thorax|thorax]] or [[abdomen]]. It is one of the five methods of clinical examination, together with [[inspection (medicine)|inspection]], [[palpation]], [[auscultation]], and inquiry. It is done with the middle finger of one hand tapping on the middle finger of the other hand using a wrist action. The
There are two types of percussion: direct, which uses only one or two fingers, and indirect, which uses the middle/flexor finger. There are four types of percussion sounds: resonant, hyper-resonant, stony dull or dull. A dull sound indicates the presence of a solid mass under the surface. A more resonant sound indicates hollow, air-containing structures. As well as producing different notes which can be heard they also produce different sensations in the pleximeter finger.
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