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Calcium, Ionized

Results and Values

What do the test results mean?

The normal range for levels of free calcium in the blood is from 4.4 to 5.3 milligrams per deciliter (mg/dl) in adults and from 4.4 to 6.0 mg/dl in children.

Abnormally high levels of free calcium may indicate:

hyperparathyroidism, or excess activity of the parathyroid glands

metastatic bone tumor, or cancer cells are spreading to other parts of the body from a tumor in the bone

milk-alkali syndrome, which occurs when continuous ingestion of antacids has caused loss of normal body acidity

multiple myeloma, a cancer of the bone marrow

Paget's disease, a bone disorder causing deformities

sarcoidosis, a disorder causing abnormalities of the bones, lungs, skin, eyes, muscles and lymph nodes

tumors producing molecules that mimic the activity of the parathyroid glands

vitamin D intoxication

Abnormally low levels of free calcium may indicate:

hypoparathyroidism, or abnormally low activity of the parathyroid glands

malabsorption of nutrients from the bowel

osteomalacia, or bone softening in adults

pancreatitis, or inflammation of the pancreas

kidney failure

rickets, or bone softening in children

vitamin D deficiency

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