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Blood calcium is tightly regulated by the parathyroid glands, kidneys, and vitamin D — and abnormal levels are almost never about how much calcium you eat. High blood calcium (hypercalcemia) is most commonly caused by overactive parathyroid glands or, less commonly, certain cancers; both require prompt medical investigation. Low calcium (hypocalcemia) can point to vitamin D deficiency, kidney disease, or parathyroid insufficiency and can cause muscle cramps, tingling, and in severe cases cardiac arrhythmias.
Also known as: Ca, Cal, Calcium, Calcium (Albumin-Corrected), Calcium (Corrected), Calcium (Total), Calcium Total, Calcium, Corrected
High calcium usually reflects a parathyroid problem, not diet. It can cause kidney stones, bone loss, and cardiac arrhythmias. Low calcium causes muscle cramps, numbness, and cardiac conduction abnormalities.
Standard range is 8.5-10.5 mg/dL. Always correct for albumin. Ionized calcium is the more accurate measure of physiologically active calcium.