Used in biomedical research to detect and quantify neutrophil elastase levels in mouse samples, particularly in studies related to inflammation, lung diseases such as chronic obstructive pulmonary disease (COPD), acute lung injury, and autoimmune conditions. Helps researchers assess neutrophil activation and degranulation in experimental models. Commonly applied in immunoassays to measure enzyme concentration in bronchoalveolar lavage fluid, serum, or tissue homogenates. Supports evaluation of therapeutic interventions targeting protease activity or inflammatory pathways in preclinical studies.