Used in research settings to quantify levels of surfactant protein A in biological samples such as bronchoalveolar lavage fluid, serum, or lung tissue extracts. SP-A is a key component of pulmonary surfactant and plays an important role in innate immune defense in the lungs. This ELISA kit enables researchers to study SP-A expression in respiratory diseases including acute respiratory distress syndrome (ARDS), chronic obstructive pulmonary disease (COPD), pulmonary fibrosis, and infections. It is also used in studies investigating lung development, neonatal respiratory disorders, and the effects of environmental toxins on lung health. The assay provides a sensitive and specific method for monitoring changes in SP-A levels under experimental or clinical conditions.