Normal Values:

Normal values range from 8.5 to 10.2 mg/dL.

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What abnormal results mean:

Higher-than-normal levels may be due to:

• Addison's disease
• Excessive vitamin D level
• Excessive calcium intake
• HIV/AIDS
• Hyperparathyroidism
• Metastatic bone tumor
• Milk-alkali syndrome
• Multiple myeloma
• Overactive thyroid gland (hyperthyroidism)
• Paget's disease
• Prolonged immobilization
• Sarcoidosis
• Tumors producing a parathyroid hormone-like substance
• Use of certain medications

Lower-than-normal levels may be due to:

• Hypoparathyroidism
• Kidney failure
• Liver disease (decreased albumin production)
• Low serum magnesium
• Malabsorption (inadequate absorption of nutrients from the intestinal tract)
• Osteomalacia
• Pancreatitis
• Rickets and vitamin D deficiency

Additional conditions under which the test may be performed:

• Delirium
• Dementia
• Multiple endocrine neoplasia (MEN) II
• Multiple endocrine neoplasia (MEN) I
• Renal cell carcinoma
• Secondary hyperparathyroidism