Fibroblast growth factor 23 (FGF-23), is recently discovered phosphaturic substance. It releases from bone osteocytes and plays a key role in the physiological regulation of phosphate metabolism. Excessive action of FGF23 results in several hypophosphatemic diseases characterized by impaired renal tubular phosphate reabsorption. In contrast, deficient action of FGF23 causes familial hyperphosphatemic tumoral calcinosis with enhanced renal tubular phosphate reabsorption. We carried out this study to gain knowledge about the current status of FGF-23 levels in our population and its relationship...