Used to measure elastase enzyme activity in rat biological samples such as serum, plasma, tissue homogenates, and cell culture supernatants. Commonly applied in research on inflammatory diseases, lung injury, and cardiovascular conditions where elastase plays a role in tissue remodeling and degradation. Enables quantitative assessment of elastase levels to evaluate disease progression or response to treatment in experimental models. Suitable for studies involving chronic obstructive pulmonary disease (COPD), pancreatitis, and ischemia-reperfusion injury in rats. Provides a sensitive and specific method to monitor protease activity linked to neutrophil activation and inflammation.