Percussion is a method of tapping body parts with fingers, hands, or small instruments as part of a physical examination. It is done to determine:
Percussion of a body part produces a sound, like playing a drum. The sound is a sign of the type of tissue within the body part or organ.
Simel DL. Approach to the patient: history and physical examination. In: Goldman L, Schafer AI, eds. . 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 6.