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Also known as: Total Calcium; Ionized Calcium
Formal name: Calcium

At a Glance

Why Get Tested?

To screen for, diagnose, and monitor a range of conditions

When to Get Tested?

As part of a routine metabolic panel; when you have symptoms of a disorder, or known presence of one, affecting your kidneys, bones, thyroid, parathyroid, or nerves or when symptoms of significantly increased or decreased calcium concentrations are present; when someone is critically ill, to monitor ionized calcium levels; when someone has certain types cancer; when someone is being treated for abnormal calcium levels, to evaluate the effectiveness of treatment

Sample Required?

A blood sample drawn from a vein in your arm; sometimes a random or a timed urine collection such as a 24-hour urine sample

Test Preparation Needed?

Current practices do not require fasting. You may be instructed to stop taking certain medications that can affect the test results, such as lithium, antacids, diuretics, and vitamin D supplements, among others.