Lung volume measurement is a process used to assess the amount of air the lungs can hold. This measurement helps healthcare professionals evaluate lung function and diagnose respiratory conditions. Common methods include spirometry, which measures the volume of air inhaled and exhaled, and plethysmography, which assesses lung volume by measuring changes in pressure within a sealed chamber. Accurate lung volume measurements are essential for understanding a person's respiratory health. They can indicate conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other lung disorders. Regular monitoring can help track disease progression and treatment effectiveness.