25-hydroxy Vitamin D(25-OHVD) CLIA kit (Chemiluminescence Immunoassay) is an in vitro diagnostic quantitative test kit. The group of compounds referred to as Vitamin D, are actually fat soluble steroidal pre-hormones. Sufficient circulating levels ofvitamin D are necessary for healthy bone maintenance and cellmetabolism. Recent studies have shown that it may also lowerincidents of certain cancers. Insufficient levels of Vitamin D canresult in osteoporosis and bone fracture in the elderly.secondary hyperparathyroidism, abnormal cell metabolism andeven increased incidents of cancer.