TABLE 1.

Classification of disorders of calcium and phosphorus metabolism.

Type	Causes
Hypercalcemia	Malignancy Hyperparathyroidism Familial hypocalciuric hypercalcemia (FHH) Sarcoidosis, etc.
Hypocalcemia	Hypoparathyroidism Pseudohypoparathyroidism (PsHP) Vitamin D deficiency
Hyperphosphatemia	Kidney disease Hypoparathyroidism Tumor lysis syndrome Rhabdomyolysis Hemolysis Hyperthermia Acute leukemia, etc.
Hypophosphatemia	Hereditary rickets: Vitamin D-dependent rickets: (VDDR1A, VDDR1B, VDDR2A, VDDR2B). Hereditary hypophosphatemic rickets: (XLDHR, ADHR, ARHR, Hypophosphatemic Rickets with Hyperparathyroidism, McCune-Albright syndrome, Raine syndrome, Opsismodysplasia, HHRH, NPHLOP1, NPHLOP2, Dent Disease) Nutritional rickets Fanconi’s syndrome