what are the causes of calcium disorders?
['low levels of vitamin D, which makes it harder to absorb calcium.', 'medications, such phenytoin, phenobarbital, rifampin, corticosteroids, and drugs used to treat elevated calcium levels.', 'pancreatitis.', 'hypermagnesemia and hypomagnesemia.', 'hyperphosphatemia.', 'septic shock.', 'massive blood transfusions.']