Which term describes tapping body surfaces to assess density?

• A. Inspection
• B. Auscultation
• C. Percussion
• D. Palpation

Answer: (C)

Percussion involves tapping on the body surface to assess density. The taps create sounds that reflect what lies beneath: air-filled areas like the lungs yield a more resonant sound, while solid structures or fluids produce duller or flatter tones. By listening to these sounds and noting where they change, you can estimate borders, detect fluid versus solid masses, and identify abnormal collections. Indirect percussion—striking with the middle finger of one hand while the other finger acts as a fulcrum on the surface—is the typical technique. This differs from inspection (visual examination), palpation (touch to feel texture and tenderness), and auscultation (listening with a stethoscope), which do not rely on tapping to judge density.