Used in biomedical research to quantify levels of soluble FAS (sFAS) in biological samples such as serum, plasma, or cell culture supernatants. This kit is essential for studying apoptosis regulation, particularly in autoimmune diseases, cancer, and inflammatory conditions where sFAS acts as a decoy receptor modulating cell death pathways. It enables researchers to assess immune system dysregulation and monitor disease progression or treatment response in experimental models. Widely applied in clinical research settings to investigate the role of the FAS/FASL signaling pathway in pathophysiology.