Used in biomedical research to quantitatively measure levels of human Syndecan-1 (CD138) in biological samples such as serum, plasma, or cell culture supernatants. This ELISA kit is particularly valuable in studies related to multiple myeloma, where CD138 serves as a key marker for plasma cells. It is also applied in cancer research, immunology, and inflammation studies, helping assess cell adhesion, tumor progression, and immune system activation. The assay enables high sensitivity and specificity, making it suitable for both clinical research and laboratory investigations into diseases involving dysregulated proteoglycan expression.