Used in research settings to quantify levels of Surfactant Protein D in biological samples such as bronchoalveolar lavage fluid, serum, or plasma. Helps in studying lung immunity and inflammatory responses. Commonly applied in investigations of respiratory diseases including COPD, asthma, cystic fibrosis, and interstitial lung diseases. Supports evaluation of SP-D as a biomarker for alveolar-capillary barrier damage and immune modulation. Enables researchers to assess the role of SP-D in host defense against pathogens like viruses, bacteria, and fungi. Widely used in preclinical studies and clinical research to understand disease mechanisms and monitor therapeutic responses.