Used for the quantitative measurement of Neutrophil Elastase (NE) activity in biological samples such as serum, plasma, and cell culture supernatants. This ELISA kit enables researchers to assess NE activity in studies related to inflammation, chronic obstructive pulmonary disease (COPD), cystic fibrosis, and other conditions involving neutrophil activation. The assay specifically detects enzymatically active NE, providing functional insight rather than just protein concentration. It is widely used in clinical research and drug development to evaluate the efficacy of elastase inhibitors and monitor disease progression.