An ionized calcium blood test measures only the amount of "free calcium" in your blood that is not attached to proteins. Typically, an ionized calcium test is only ordered if the results from a total calcium test are not normal. This test may also be ordered if you have a condition that affects your body's ability to balance the amount of ionized and bound calcium in your blood, or if you are seriously ill or having surgery.
This page is provided for educational and informational purposes only and does not constitute the provision of medical advice or professional services. The information provided should not be used for diagnosing or treating a health problem or disease, and those seeking personal medical advice regarding any of the tests and conditions referenced above are advised to consult with a licensed clinician. Always seek the advice of your qualified health provider regarding a medical condition and do not disregard professional medical advice or delay in seeking it because of any information on this page. If you think you may have a medical emergency, immediately call 911 or go to the nearest urgent care center or hospital.