25-Hydroxy  vitamin  D  represents  the main  body  reservoir  and  transport  form. Mild to moderate deficiency is associated  with Osteoporosis  /  Secondary Hyperparathyroidism  while  severe deficiency causes Rickets in children and  Osteomalacia in adults.  Prevalence of Vitamin D deficiency is approximately >50% specially  in  the  elderly. This assay is  useful for diagnosis of vitamin D deficiency and Hypervitaminosis D. It is  also  used  for  differential diagnosis of causes of Rickets & Osteomalacia  and for monitoring Vitamin D replacement therapy.
2 ml serum
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