Used in biomedical research to quantify neutrophil elastase activity in biological samples such as serum, plasma, bronchoalveolar lavage fluid, and cell culture supernatants. It helps assess inflammatory conditions where neutrophil activation plays a key role, including chronic obstructive pulmonary disease (COPD), cystic fibrosis, acute respiratory distress syndrome (ARDS), and rheumatoid arthritis. The kit enables researchers to monitor disease progression, evaluate therapeutic efficacy of anti-inflammatory drugs, and study the role of proteases in tissue remodeling and immune response. Its high sensitivity and specificity make it suitable for clinical diagnostics and drug development studies involving neutrophil-mediated inflammation.