Phosphate is essential for bone metabolism and for energy provision. Phosphate homeostasis is achieved by hormonal feedback mechanisms, predominantly parathyroid hormone, fibroblast growth factor 23 and calcitriol, with renal phosphate absorption taking on a special role. Although even large deviations from the serum normal range are rarely symptomatic, the health consequences can be significant. Essentially, the clinically relevant disturbances in phosphate balance can be attributed to three mechanisms: 1. shifts of phosphate between the extracellular space and the cytosol; 2. inadequate phosphate reabsorption in the kidney; 3. decreased intestinal phosphate absorption. Knowledge of physiology enables diagnosis and therapy of phosphate disorders.
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