Used for the quantitative measurement of Deoxyadenosine kinase (DAO) activity in biological samples such as serum, plasma, and tissue lysates. This ELISA kit enables researchers to assess DAO enzyme function, which plays a role in purine metabolism and immune regulation. It is commonly applied in studies related to autoimmune diseases, neurological disorders, and cancer research where dysregulation of nucleoside metabolism is investigated. The assay provides a reliable and sensitive method for high-throughput screening in clinical and pharmaceutical research settings.