Calcium - ionized

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Free calcium; Ionized calcium

Normal values may vary slightly from laboratory to laboratory.

• Children: 4.4 - 6.0 milligrams per deciliter (mg/dL)
• Adults: 4.4 - 5.3 mg/dL

Greater-than-normal levels may be due to:

• Hyperparathyroidism
• Immobilization
• Decreased urinary calcium levels of unknown cause (idiopathic hypocalciuria)
• Metastatic bone tumor
• Milk-alkali syndrome
• Multiple myeloma
• Paget's disease
• Sarcoidosis
• Too much vitamin D
• Certain types of tumors
• Use of thiazide diuretics

Lower-than-normal levels may be due to:

• Hypoparathyroidism
• Malabsorption
• Osteomalacia
• Pancreatitis
• Renal failure
• Rickets
• Vitamin D deficiency

Review Date: 08/31/2010
Reviewed By: A.D.A.M. Editorial Team: David Zieve, MD, MHA, and David R. Eltz. Previously reviewed by David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine (5/13/2009).

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org).

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