Adults: 8.5-10.9 mg/dL
Children: 8.5-10.9 mg/dL
In the International System of Units (SI), calcium in the blood is measured in mmol/l. The normal blood calcium levels in the SI are:
Adults: 2.12-2.72 mmol/L
Children: 2.12-2.72 mmol/L
Each laboratory must establish its own normal ranges for calcium in the blood. These ranges depend on the makeup of the local population, the technologies used and the accuracy of the measurement. There may be also slight differences in the normal levels, according to age, gender, race or ethnic origin, geographic region, diet, type of sample and other relevant status.
Your doctor will study the results along with your medical record, screenings, physical condition, symptoms and any other relevant information about your situation.
Calcium is an essential element to perform specialized functions in all the cells of our body. That is the reason why calcium in the blood (Ca2+) must be carefully controlled and it is so important to maintain calcium blood levels within a fairly narrow range.
Calcium is one of the most important and the most abundant mineral in the human body. Calcium is essential for a good function of our organism. It is essential to develop and maintain healthy bones and teeth. Calcium phosphate salts forming crystals constitute the main component of bones and teeth. Calcium plays also an important role in the activity of the heart (cardiac muscle contraction) and along with potassium and sodium is necessary to the transmission of nerve impulses to the muscle.
Calcium is supplied in the food we eat and it is excreted by the kidneys. Bones are the main storage place of calcium in the body (99%). However, it is possible to find some calcium in the blood.
Blood calcium can be free or bound to other substances. 40% of blood calcium is free and is called ionized calcium or free calcium. 50% is bound to proteins (albumin mainly) and 10% is bound to other minerals (phosphorus, etc.)
Blood calcium concentration is regulated by:
Vitamin D, lactose or acid blood pH can increase calcium absorption from the intestine.
The calcium blood test does not measure levels of bone calcium, but rather how much calcium is circulating in the blood.
The calcium blood test is ordered to find:
High calcium blood levels (hypercalcemia or hypercalcemia) can be a result of suffering from hyperparathyroidism or bone mass loss.
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The following values are considered to be normal values:
IMPORTANT: These levels are expressed in mg/dl. They are an example of a healthy man of about 45 years old with no known disease and not taking any medication. The ranges can be different depending on the laboratory or on your personal circumstances.