Used in biomedical research to quantify levels of pulmonary surfactant protein in human lung samples, aiding in the study of respiratory diseases such as acute respiratory distress syndrome (ARDS), neonatal respiratory distress, and interstitial lung diseases. Enables researchers to assess lung immune function and alveolar integrity by measuring specific surfactant proteins in bronchoalveolar lavage fluid or serum. Commonly applied in clinical labs and pharmaceutical research for monitoring disease progression and evaluating therapeutic interventions targeting lung surfactant metabolism.