Blood Calcium Test: About This Test

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What is it?

A test for calcium in the blood checks the level of calcium in your body that is not stored in your bones. Almost all of the calcium in the body is stored in bone. The rest is found in the blood.

The body needs calcium to build and fix bones and teeth, to help nerves work, to make muscles squeeze together, to help blood clot, and to help the heart to work.

Why is this test done?

A blood calcium test may be done:

  • To check for problems with the parathyroid glands or kidneys, certain types of cancers and bone problems, or inflammation of the pancreas (pancreatitis).
  • To find a reason for an abnormal electrocardiogram (EKG) test.
  • To see if you have a very low calcium level in your blood.
  • To see if you have a very high calcium level in your blood.

How can you prepare for the test?

  • Do not take calcium supplements for 8 to 12 hours before having a blood calcium test.
  • Your doctor will tell you if you should not eat or drink anything before your test.

What happens during the test?

A health professional takes a sample of your blood.

What else should you know about the test?

A blood calcium test cannot be used to check for a lack of calcium in your diet or for the loss of calcium from your bones (osteoporosis). The body can have normal calcium levels even if your diet does not have enough calcium in it. Other tests, such as a bone density test, check the amount of calcium in your bones.

What happens after the test?

  • You will probably be able to go home right away.
  • You can go back to your usual activities right away.

Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.

Where can you learn more?

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Current as of: October 9, 2017