Which test is typically performed to assess a patient's lung function?

Spirometry is the standard test used to assess lung function. It measures the volume of air inhaled and exhaled by the lungs and evaluates how efficiently air moves in and out of the respiratory system. This test provides critical information about lung capacity and function, allowing healthcare providers to diagnose conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other respiratory issues.

While chest X-rays are useful for visualizing the structure of the lungs and detecting abnormalities, and blood gas analysis can provide information on the body's oxygen and carbon dioxide levels, neither directly measures lung function like spirometry does. An electrocardiogram focuses on the heart's electrical activity, thus it is not related to lung function assessment. Therefore, spirometry is the most appropriate choice for evaluating how well a patient's lungs are working.