Used in biomedical research to measure fibroblast growth factor 23 (FGF-23) levels in human serum or plasma samples. This assay helps in studying disorders related to phosphate metabolism, such as chronic kidney disease, hypophosphatemic rickets, and tumor-induced osteomalacia. Researchers use the kit to evaluate FGF-23 concentration changes in clinical studies, assess disease progression, and monitor response to treatments targeting mineral and bone metabolism pathways. The ELISA format allows for high sensitivity and specificity, making it suitable for both small and large-scale studies.