Which calcium test to do?
Ionized calcium gives you a true estimate of the actual USEFUL amount of calcium in your blood.
Ionized calcium is the calcium that is not bound to other substances in the blood. This calcium is the one that is deposited in your bones.
Total calcium, which is measured by most routine labs, is a sum of all the different types of calcium and does not reflect the actual USEFUL amount of calcium in your blood
The normal range is 4.8 - 5.6 mg/dl