Used to measure Alpha-1-Antichymotrypsin (AACT) activity in human biological samples such as serum, plasma, or cell culture supernatants. This ELISA kit is commonly applied in clinical research and diagnostic laboratories to study inflammatory conditions, as AACT is an acute-phase protein elevated during inflammation, infection, and tissue injury. It helps in monitoring diseases like rheumatoid arthritis, Alzheimer's disease, and certain cancers where AACT levels are altered. The kit enables quantitative analysis, supporting biomarker validation and therapeutic response studies.