Used in biomedical research to quantify levels of secretory leukocyte protease inhibitor (SLPI) in biological samples such as saliva, serum, and cell culture supernatants. This ELISA kit enables researchers to study SLPI's role in inflammatory processes, tissue protection, and immune regulation. It is commonly applied in studies related to chronic inflammation, respiratory diseases like COPD, periodontal disease, and HIV infection, where SLPI modulates protease activity and exhibits antimicrobial and anti-inflammatory properties. The assay supports high-throughput analysis with high sensitivity and specificity, making it valuable for both clinical research and drug development.