Used in biomedical research to detect and quantify neutrophil elastase levels in rat samples, particularly in studies related to inflammation, lung diseases such as emphysema and acute respiratory distress syndrome (ARDS), and immune responses. Enables researchers to assess neutrophil activation and degranulation in experimental models, supporting investigations into anti-inflammatory therapies, infection responses, and tissue injury mechanisms. Commonly applied in preclinical studies using rat models to evaluate disease progression and treatment efficacy.