Pulmonary Function Test
Imaging & Scans
≈ ¥20-50
(≈ $3-7)
15 min
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Description
Estimated cost for Pulmonary Function Test at general public hospitals in China is about ¥15-40, and at Grade 3A hospitals about ¥20-50, varying by hospital tier and region.
Main Uses
Pulmonary function tests (PFTs) are primarily used to diagnose and monitor respiratory conditions such as asthma, COPD, and restrictive lung diseases. They help in assessing the severity of these conditions, evaluating the effectiveness of treatment, and guiding decisions about therapy. PFTs are also used before surgery to assess the risk of postoperative complications in patients with known or suspected lung disease.
Normal Range
For spirometry, common indicators include Forced Vital Capacity (FVC) and Forced Expiratory Volume in one second (FEV1). The normal range for FVC is typically 80-120% of the predicted value based on age, height, and gender. FEV1 should be at least 70-80% of FVC. For diffusion capacity (DLCO), a normal range is usually 80-120% of the predicted value.
Low Values - Possible Causes
Chronic obstructive pulmonary disease (COPD), asthma, restrictive lung diseases such as interstitial lung disease or pulmonary fibrosis, chest wall deformities, and neuromuscular disorders can cause low values in lung function tests.
High Values - Possible Causes
High values are less common but may occur due to overinflation of the lungs as seen in emphysema, or in some cases, due to technical errors during the test. It's also possible in individuals with very high physical fitness levels, though this is not typical.