How is pulmonary function testing performed?

Pulmonary function testing (PFT) is one of the most common diagnostic procedures in respiratory medicine. It enables clinicians to clearly identify various pulmonary diseases. So, how is pulmonary function testing performed? Below is a detailed explanation.

How Is Pulmonary Function Testing Performed?

During pulmonary function testing, the patient’s nostrils are clamped shut, and breathing must be done exclusively through the mouth. The patient should tightly seal their lips around the mouthpiece to prevent air leakage throughout the test. They must follow the technician’s verbal instructions precisely, performing inhalation and exhalation maneuvers promptly. Specifically, the patient should inhale maximally, then exhale with maximum force and speed. Pulmonary function testing is a routine diagnostic tool for respiratory disorders, allowing detection of abnormalities in both the airways and lung parenchyma. It aids in assessing disease severity, predicting prognosis, and differentiating causes of dyspnea. However, certain patients are not suitable candidates for PFT—such as those with acute pneumothorax or rib fractures, individuals with severe cardiopulmonary disease, pregnant women, and patients with serious infectious diseases.

Additional Information: Clinical Applications of Pulmonary Function Testing

1. Assessment of Pulmonary Function Status

Long-term smoking can impair pulmonary function. Similarly, individuals chronically exposed to occupational hazards or living in suboptimal environmental conditions may undergo PFT to objectively evaluate their lung health. Early detection of functional abnormalities allows timely intervention and helps preserve optimal pulmonary function.

2. Diagnosis of Specific Diseases

For patients presenting with chronic cough of unclear etiology, PFT can help determine the underlying cause. In cases of suspected asthma or other obstructive or restrictive lung diseases, PFT provides objective evidence for diagnosis and guides treatment planning. Additionally, preoperative PFT is valuable for comprehensive assessment of a patient’s respiratory status, thereby optimizing surgical safety and outcomes.

The above outlines how pulmonary function testing is performed. We hope this information proves helpful to you.