Table 1.

Factors that alter renal regulation of calcium

Increase Calcium AbsorptionDecrease Calcium Absorption
HyperparathyroidismHypoparathyroidism
CalcitriolLow calcitriol levels
HypocalcemiaHypercalcemia
Volume contractionExtracellular fluid expansion
Metabolic alkalosisMetabolic acidosis
Thiazides diureticsLoop diuretics