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A low calcium level in the blood indicates hypocalcemia, which is an electrolyte imbalance. Calcium levels in adults should be between 4.5 and 5.5 mEq/L. Calcium is required for strong bones and teeth, as well as proper muscle and nerve function. The parathyroid hormone (PTH), your kidneys, and your intestines keep your blood calcium levels at an optimum level. The action of PTH, in most cases, restores calcium levels to normal. On the other hand, hypocalcemia can occur when something lowers your blood calcium levels, and your body cannot respond appropriately to increase calcium levels in return effectively.