Disorders that affect how your intestines absorb nutrients
Overactive thyroid gland or taking too much thyroid hormone medication
Your doctor may also order this test if you have been on bed rest for a long time.
About half of the calcium in the blood is attached to proteins. A separate test measures calcium that is not attached to proteins in your blood. Such calcium is called free or ionized calcium. See: Calcium - ionized
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.
The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.
What Abnormal Results Mean
Higher than normal levels may be due to a number of health conditions. Common causes include:
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.