CPFT Practice Exam 2026 – Complete Test Prep Guide

Pulmonary function tests (PFTs) are valuable diagnostic tools that measure how well the lungs are functioning. They assess various aspects of lung performance, such as the volumes of air the lungs can hold, how quickly air can be exhaled, and how well oxygen and carbon dioxide are exchanged.

The correct choice reflects that PFTs are particularly useful in diagnosing both obstructive and restrictive lung diseases. Obstructive lung diseases, like asthma and chronic obstructive pulmonary disease (COPD), are characterized by trouble getting air out of the lungs due to airway narrowing or blockage. Restrictive lung diseases, on the other hand, involve a decreased ability to expand the lungs fully, as seen in conditions like pulmonary fibrosis or neuromuscular disorders.

While pulmonary function tests can provide insights into a wide variety of respiratory conditions, indicating abnormalities in lung function, they are not limited to a singular diagnosis, such as asthma or lung cancer. Therefore, the statement that PFTs can help diagnose obstructive and restrictive lung diseases encompasses a critical element of respiratory assessment, acknowledging the tests' broader applicability in clinical evaluations of lung health.