Used in biomedical research to quantify levels of human β-defensin 4 in biological samples such as serum, plasma, saliva, and cell culture supernatants. This ELISA kit helps study the role of β-defensin 4 in innate immunity, particularly its involvement in antimicrobial defense and inflammatory responses. It is widely applied in immunology and infectious disease research to investigate conditions like respiratory infections, skin disorders, and autoimmune diseases where defensin expression is altered. The assay provides a sensitive and specific means to monitor changes in β-defensin 4 concentration under experimental or clinical conditions, supporting both diagnostic development and mechanistic studies.