How do inspection, palpation, percussion, and auscultation contribute to a physical examination?

In a medical physical examination, clinicians utilize four fundamental techniques to gather diagnostic data, often establishing a working diagnosis before selecting further tests.1

• Inspection: This is a visual examination that begins with observing a patient’s general appearance, posture, nutrition, and symmetry. It allows physicians to identify external signs of disease, such as skin lesions, nail changes, or signs of infection, often providing critical diagnostic clues before any physical contact occurs.2
• Palpation: This involves using the hands to feel the body surface to determine the characteristics of underlying organs and tissues. It is used to detect tenderness, muscle rigidity, organ enlargement, tumors, or abnormal masses, such as an aneurysm or an inflamed gallbladder.34
• Percussion: This technique entails striking the body with short, sharp taps to produce sounds. These sounds help determine the size and position of internal organs and reveal the presence of fluid or air in the chest, aiding in the diagnosis of lung disorders.5
• Auscultation: This is the act of listening to internal body sounds, typically using a stethoscope. It is essential for diagnosing heart-valve malfunctions, assessing heart rhythms, and evaluating lung function by listening to breathing sounds.6