Which test is commonly used to assess lung function?

Spirometry is a key diagnostic tool in assessing lung function, measuring how much air a person can inhale and exhale, as well as how quickly air can be exhaled. It provides valuable information on various lung conditions, such as asthma, chronic obstructive pulmonary disease (COPD), and other respiratory issues. By evaluating parameters like forced vital capacity (FVC) and forced expiratory volume in one second (FEV1), spirometry helps healthcare providers determine both the presence and severity of underlying pulmonary problems.

In contrast, options like X-ray and MRI scans are imaging techniques primarily used to visualize the structure of the lungs rather than directly measure their function. While these imaging tests can identify abnormalities such as tumors or infections, they do not provide insight into lung capacity or airflow dynamics. A blood test, on the other hand, is useful for assessing blood gases or other metabolic functions but does not assess lung function directly. Thus, spirometry stands out as the most accurate and commonly utilized method for evaluating how well the lungs are working.