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Severity Serum calcium level (mg/dL) Treatment Mild 10.2–12.0 Stop causative medications and encourage oral hydration Moderate 12.0–14.0 Start intravenous (IV) normal saline at maintenance dose if symptoms have been present without resolution Severe > 14.0 Start IV normal saline at maintenance dose, consider combined calcitonin and bisphosphonate therapy If no improvement, consider denosumab or a glucocorticoid Very severe > 18.0 Consider dialysis in patients with worsening renal failure or neurologic symptoms (or both)