Used to quantitatively measure human osteoprotegerin (OPG) levels in biological samples such as serum, plasma, and cell culture supernatants. This ELISA kit is widely applied in bone metabolism research, particularly in studies related to osteoporosis, rheumatoid arthritis, and other bone-related diseases. It enables researchers to assess OPG's role in regulating bone resorption by acting as a decoy receptor for RANKL. The kit is also used in clinical research to investigate cardiovascular diseases, as elevated OPG levels have been associated with vascular calcification and atherosclerosis. Its high sensitivity and specificity make it suitable for both diagnostic and prognostic evaluations in research settings.