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CME: Hypercalcemia Abstract. Hypercalcemia is defined as albumin-corrected calcium >2.6 mmol/l. Symptoms of hypercalcemia are mainly neurological-psychiatrical and cardiovascular. Severe symptomatic hypercalcemia is an emergency and requires an immediate therapy. At the same time, the underlying cause of hypercalcemia has to be identified and treated. Based on pathophysiology, hypercalcemia can be divided into four groups: parathyroid hormone dysfunction, disturbances of vitamin D metabolism, of bone metabolism or of renal calcium excretion. Medical history and specific laboratory diagnostics help to identify one of these groups and to make the correct final diagnosis.