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PTH: parathyroid hormone
| Factors that increase renal Ca reabsorption | Factors that decrease renal Ca reabsorption |
| Calcitriol | Calcitriol deficiency |
| Hyperparathyroidism (increased PTH) | Hypoparathyroidism (decreased PTH) |
| Hypocalcemia | Hypercalcemia |
| Metabolic alkalosis | Metabolic acidosis and respiratory acidosis |
| Thiazide diuretics, amiloride | Loop diuretics, mannitol |
| Hypovolemia | Hypervolemia |
