What is the role of pulmonary function tests (PFTs)?

What is the role of pulmonary function tests (PFTs)?

• A. To assess lung function and capacity, helping diagnose respiratory conditions.
• B. Measure blood oxygen levels only.
• C. Detect metabolic acidosis.
• D. Evaluate cardiac function exclusively.

Answer: (A)

Pulmonary function tests quantify how well the lungs move air and exchange gases, providing objective measurements of lung volumes, airflow, and diffusion capacity. This information helps distinguish different types of respiratory problems: obstructive patterns where airflow is limited (such as asthma or COPD) and restrictive patterns where lung capacity is reduced (such as interstitial lung disease). By looking at metrics like FEV1, FVC, the FEV1/FVC ratio, total lung capacity, and DLCO, clinicians can classify the abnormal pattern, assess severity, monitor progression, and evaluate response to therapy. PFTs are also useful before surgery to gauge respiratory risk and plan perioperative care. They are not measures of current oxygen levels or gas exchange obtained from immediate oxygen saturation alone, nor do they diagnose metabolic disturbances or directly evaluate cardiac function. The main purpose is to quantify lung function and capacity to support diagnosis and management of respiratory conditions.

Pulmonary function tests quantify how well the lungs move air and exchange gases, providing objective measurements of lung volumes, airflow, and diffusion capacity. This information helps distinguish different types of respiratory problems: obstructive patterns where airflow is limited (such as asthma or COPD) and restrictive patterns where lung capacity is reduced (such as interstitial lung disease). By looking at metrics like FEV1, FVC, the FEV1/FVC ratio, total lung capacity, and DLCO, clinicians can classify the abnormal pattern, assess severity, monitor progression, and evaluate response to therapy. PFTs are also useful before surgery to gauge respiratory risk and plan perioperative care. They are not measures of current oxygen levels or gas exchange obtained from immediate oxygen saturation alone, nor do they diagnose metabolic disturbances or directly evaluate cardiac function. The main purpose is to quantify lung function and capacity to support diagnosis and management of respiratory conditions.