This study will measure the effect of cinacalcet (Sensipar) on parathyroid hormone (PTH) secretion in children and adolescents with hypophosphatemic rickets (XLH). The investigators are seeking evidence that patients with XLH may benefit from treatment with cinacalcet by achieving better control of PTH secretion.
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Change of serum Parathyroid Hormone (PTH) with use of cinacalcet
Timeframe: Baseline, 30 minutes, and 4 hours post dose