CalciumThis test is used to measure serum levels of calcium, the most abundant mineral in the body. More than 98% of the body's calcium is found in bones and teeth, but relative concentrations in those structures may vary as the body maintains calcium balance. For example, when calcium concentrations in the blood fall below normal, calcium ions move out of the bones and teeth to restore the blood's calcium level. Because the body excretes calcium daily, regular ingestion of calcium in food (at least 1 g/day) is necessary for normal calcium balance Purpose
Patient preparation
Procedure and posttest care
Reference values
Abnormal findingsAbnormally high serum calcium levels (hypercalcemia) may occur in hyperpllrothyroidism and parathyroid tumors, Paget's disease of the bone, multiple myeloma, metastatic carcinoma, multiple fractures, and prolonged immnbilization. Elevated levels may also result from inadequate excretion of "calcium, as in adrenal insufficiency and renal disease; from excessive calcium ingestion; and from overuse of overuse such as calcium carbonat. Interfering factors
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