Increased phosphate intake (Vitamin D, laxative abuse)
Increased renal reabsorption (Hypoparathyroidism)
Decreased excretion (Renal failure
Transcellular shifts (Tumor lysis syndrome, Rhabdomyolysis)
Hyperphosphatemia
Calciphylaxis
Hypophosphatemia
Vitamin D intoxication
Hypocalcemia
Tumor lysis syndrome
Hypokalemia
Laxative 