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Normal Calcium Levels in Blood Tests

Updated April 17, 2017

Calcium is the most abundant mineral in the human body, and it is essential for the proper function of virtually every cell. Since the body loses calcium every day, it should be included in the diet. Dietary calcium can come from some fruits and vegetables, dairy products, eggs and fish. A blood (serum) calcium test actually measures the calcium that is not in bones.

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In addition to helping to build bones and teeth, calcium is essential for muscle contraction, heart function, nerve function and blood clotting.


Calcium circulates in the blood in two forms: it can either be bound to such transport proteins as albumin or be found in free, "ionized" form.

Normal Calcium Levels in Adults

While normal blood calcium levels differ slightly from lab to lab, they usually range between 8.5 and 10.5 mg/dl (milligrams of calcium per decilitre of blood). Ionised calcium typically ranges from about 4.6 to 5.3 mg/dl

Normal Calcium Levels in Children

Because they are growing, children can have slightly lower or higher blood calcium than adults, with normal levels ranging from 7.6 to 10.8 mg/dl

Reasons for High Values

High blood calcium (hypercalcemia) can occur for such reasons as: dehydration, an overactive parathyroid gland (hyperparathyroidism), certain cancers, getting too much calcium or vitamins A and D from the diet, abusing calcium medicines and certain diseases.

Reasons for Low Values

Low blood calcium (or hypocalcaemia) can have various causes, including: bone problems, low levels of the blood protein albumin, inflammation of the pancreas, kidney disease, malfunction of the parathyroid gland (hypoparathyroidism) and improper absorption of foods or calcium.

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About the Author

Suzanne Fantar

Suzanne Fantar has been writing online since 2009 as an outlet for her passion for fitness, nutrition and health. She enjoys researching and writing about health, but also takes interest in family issues, poetry, music, Christ, nature and learning. She holds a bachelor's degree in biological sciences from Goucher College and a MBA in healthcare management from the University of Baltimore.

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