The MedFrontier FGF23 (Human Intact FGF23) CLEIA ELISA Assay is a sandwich CLEIA that measures ONLY the full-length active form (intact form). FGF23 is being researched in the context of X-linked hypophosphatemic rickets, mineral bone disorder (MBD), chronic kidney disease (CKD), tumor-induced osteomalacia and hyperphosphatemia. MedFrontier FGF23 is for Research Use Only and is not intended for use in diagnostic or therapeutic procedures.