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Ryan McVay/Photodisc/Getty Images. Normal Calcium Levels in Adults. While normal blood calcium levels differ slightly from lab to lab, they usually range between 8.5 and 10.5 mg/dL (milligrams of calcium per deciliter of blood). Ionized calcium typically ranges from about 4.6 to 5.3 mg/dL. Jupiterimages/Pixland/Getty Images.
When the calcium level in the blood is too high, the cells of the parathyroids make less parathyroid hormone (or stop making it altogether), thereby allowing calcium levels to decrease. This feed-back mechanism runs constantly, thereby maintaining calcium (and parathyroid hormone) in a very narrow normal range.