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Calcium (Ca) in Blood Test

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Test Overview

A test for calciumcalcium in the blood checks the calcium level in the body that is not stored in the bones. Calcium is the most common mineral in the body and one of the most important. The body needs it to build and fix bones and teeth, help nerves work, make muscles squeeze together, help blood clot, and help the heart to work. Almost all of the calcium in the body is stored in bone.

Normally the level of calcium in the blood is carefully controlled. When blood calcium levels get low (hypocalcemiahypocalcemia), the bones release calcium to bring it back to a good blood level. When blood calcium levels get high (hypercalcemiahypercalcemia), the extra calcium is stored in the bones or passed out of the body in urine and stool. The amount of calcium in the body depends on the amount of:

Calcium you get in your food.
Calcium and vitamin Dvitamin D your intestines absorb.
PhosphatePhosphate in the body.
Certain hormoneshormones, including parathyroid hormoneparathyroid hormone, calcitonincalcitonin, and estrogenestrogen in the body.

Vitamin D and these hormones help control the amount of calcium in the body. They also control the amount of calcium you absorb from food and the amount passed from the body in urine. The blood levels of phosphate are closely linked to calcium levels and they work in opposite ways: As blood calcium levels get high, phosphate levels get low, and the opposite is also true.

Most people who have low or high levels of calcium do not have any symptoms. Calcium levels need to be very high or low to cause symptoms.

Why It Is Done

A blood calcium test may be done:

To check for problems with the parathyroid glandsparathyroid glands or kidneys, certain types of cancers and bone problems, or inflammation of the pancreas (pancreatitispancreatitis).
To find a reason for an abnormal electrocardiogram (EKG)electrocardiogram (EKG) test.
After a kidney transplantkidney transplant.
To see if your symptoms may be caused by a very low calcium level in the blood. Such symptoms may include muscle cramps, spasms, and twitching and tingling in the fingers and around the mouth.
To see if your symptoms may be caused by a very high calcium level in the blood. Such symptoms may include weakness, lack of energy, not wanting to eat, nausea and vomiting, constipation, urinating a lot, belly pain, or bone pain.
As part of a routine blood test.

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

How To Prepare

How It Is Done

How It Feels

Risks

Results

Normal

Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.

Normal blood calcium values are lower in older people.

You may also have values for an ionized calcium test. This test checks the amount of calcium that is not attached to protein in the blood. The level of ionized calcium in the blood is not affected by the amount of protein in the blood.

High values

High values of calcium may be caused by:

HyperparathyroidismHyperparathyroidism.
Cancer, including cancer that has spread to the bones.
TuberculosisTuberculosis.
Being on bed rest for a long time.
Paget's diseasePaget's disease.

Low values

Low values of calcium may be caused by:

A low level of the blood protein albuminalbumin (hypoalbuminemia).
HypoparathyroidismHypoparathyroidism.
High levels of phosphate in the blood. This can be caused by kidney failurekidney failure, laxative use, and other things.
Malnutrition caused by diseases such as celiac diseaseceliac disease, pancreatitispancreatitis, and alcohol use disorderalcohol use disorder.
OsteomalaciaOsteomalacia.
RicketsRickets.

Current as of: April 30, 2024

Author: Ignite Healthwise, LLC StaffIgnite Healthwise, LLC Staff

Clinical Review BoardClinical Review Board
All Ignite Healthwise, LLC education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

This information does not replace the advice of a doctor. Ignite Healthwise, LLC, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of UseTerms of Use. Learn how we develop our contenthow we develop our content.

To learn more about Ignite Healthwise, LLC, visit webmdignite.comwebmdignite.com.

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