Calcium (ionized)

Alternative names:

free calcium; ionized calcium

Normal values:

children: 4.4 to 6.0 mg/dl
adult: 4.4 to 5.3 mg/dl

Note: mg/dl = milligrams per deciliter

What abnormal results mean:

Greater-than-normal levels may indicate:

• hyperparathyroidism
• metastatic bone tumor
• milk-alkali syndrome
• multiple myeloma
• Paget's disease
• sarcoidosis
• tumors producing a PTH-like substance
• vitamin D intoxication

Lower-than-normal levels may indicate:

• hypoparathyroidism
• malabsorption
• osteomalacia
• pancreatitis
• renal failure
• rickets
• vitamin D deficiency