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Diagnosis should generally include either a calculation of corrected calcium or direct measurement of ionized calcium level and be confirmed after a week. [1] This is because either high or low serum albumin levels does not show the true levels of ionised calcium. [15]
Calcium regulation in the human body. [6]The plasma ionized calcium concentration is regulated within narrow limits (1.3–1.5 mmol/L). This is achieved by both the parafollicular cells of the thyroid gland, and the parathyroid glands constantly sensing (i.e. measuring) the concentration of calcium ions in the blood flowing through them.
The amount of biologically active calcium varies with the level of serum albumin, a protein to which calcium is bound, and therefore levels of ionized calcium are better measures than a total calcium; however, one can correct a total calcium if the albumin level is known. [citation needed]
In contrast, ionized calcium is a measure of free calcium. An abnormally high level of calcium in plasma is termed hypercalcemia and an abnormally low level is termed hypocalcemia , with "abnormal" generally referring to levels outside the reference range .
It is the first of its kind to directly measure levels of calcium and magnesium in blood — a much more reliable method of assessing nutrient status. This, the authors hope, might provide clearer ...
A basic metabolic panel including calcium is sometimes colloquially referred to as a "CHEM-8". Calcium, as an alkaline earth metal, is also an electrolyte, but abnormalities are more commonly associated with malnutrition, osteoporosis, or malignancy, especially of the thyroid. [citation needed]
Milk-alkali syndrome (MAS), also referred to as calcium-alkali syndrome, is the third most common cause of elevated blood calcium levels (hypercalcemia). [ 2 ] [ 3 ] Milk-alkali syndrome is characterized by hypercalcemia, metabolic alkalosis , and acute kidney injury .
Increased levels of protein in the urine, proteinuria, can be measured with a urine dipstick test. Three different tests may be used to measure calcium levels in urine, 24-hour urine tests, blood tests, and genetic tests. Measuring calcium levels can also be done using an oral calcium tolerance test. [24]